Replace ListServers hack with update ServerById
Replace ListServers hack with update ServerById

[gophercloud#168](https://github.com/rackspace/gophercloud/issues/168) has been
patched to not panic on non-existing server id's. If an error is returned,
check if the error is a 404 first before bailing.

ober/packer,jean/packer,dave2/packer,Silver90/packer,tas50/packer,pearkes/packer,Banno/packer,btd/packer,Xiol/packer,mgk/packer,mefellows/packer,ricardclau/packer,paulmey/packer,dieu/packer,cyberhouse/packer,jasonchaffee/packer,samdunne/packer,monkeylittleinc/packer,orivej/packer,burnzy/packer,arizvisa/packer,routelastresort/packer,tomwilkie/packer,markpeek/packer,vtolstov/packer,henrysher/packer,eranchetz/packer,beni55/packer,rnaveiras/packer,evertrue/packer,grubernaut/packer,sequenceiq/packer,higebu/packer,ttaylor249/packer,quantang/packer,c22/packer,manicai/packer,Sheile/packer,higebu/packer,legal90/packer,LinusU/packer,yoctocloud/packer,bryson/packer,justincampbell/packer,eranchetz/packer,cyberhouse/packer,pvandervelde/packer,mindjiver/packer,jamesleech/packer,jarl-dk/packer,p1-nico/packer,bryson/packer,mayflower/packer,jamesbishopp/packer,gbarberi/packer,AlphaStaxLLC/packer,KFishner/packer,jarl-dk/packer,sobrinho/packer,ttaylor249/packer,LinusU/packer,aneeshusa/packer,avldya/packer,jae2/packer,arizvisa/packer,burnzy/packer,jarl-dk/packer,Akasurde/packer,paulvollmer/packer,burnzy/packer,trumant/packer,icnocop/packer,jamesbishopp/packer,jen20/packer,rickard-von-essen/packer,zeliff/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,jonathankarsh/packer,qur/packer,bryson/packer,yonglehou/packer,fnoeding/packer,tracyde/packer,ldejager/packer,paulmey/packer,KohlsTechnology/packer,hashicorp/packer,sansb/packer,mindjiver/packer,rickard-von-essen/packer,samdunne/packer,mansunkuo/packer,hasJackb/packer,eranchetz/packer,oliviertremblay/packer,threatstream/packer,mwhooker/packer,taliesins/packer,oliviertremblay/packer,esemplare/packer,bryson/packer,styro/packer,paulmey/packer,pvanbuijtene/packer,dieu/packer,dave2/packer,boumenot/packer,rrva/packer,paulvollmer/packer,sgirones/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,mansunkuo/packer,boumenot/packer,trumant/packer,mafrosis/packer,pecigonzalo/packer,grubernaut/packer,youhong316/packer,justincampbell/packer,jasonchaffee/packer,dev-head/packer,jamesleech/packer,zhuzhih2017/packer,evertrue/packer,umang1912/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,mohae/packer,marc-ta/packer,marklap/packer,markpeek/packer,avldya/packer,pearkes/packer,zeliff/packer,visioncritical/packer,mefellows/packer,shaunduncan/packer,esemplare/packer,jen20/packer,blairham/packer,napramirez/packer,dieu/packer,Banno/packer,rk295/packer,p1-nico/packer,evertrue/packer,jszwedko/packer,quantang/packer,mansunkuo/packer,sneal/packer,gbarberi/packer,tas50/packer,LinusU/packer,mansunkuo/packer,rk295/packer,ricardclau/packer,ttaylor249/packer,noplay/packer,KFishner/packer,boumenot/packer,pvanbuijtene/packer,mayflower/packer,hasJackb/packer,bensojona/packer,oliviertremblay/packer,ttaylor249/packer,ldejager/packer,grange74/packer,jonathankarsh/packer,taliesins/packer,styro/packer,higebu/packer,threatstream/packer,dayglojesus/packer,mvanholsteijn/packer,mwhooker/packer,pecigonzalo/packer,umang1912/packer,youhong316/packer,zhuzhih2017/packer,henrysher/packer,mafrosis/packer,jsternberg/packer,jgkim/packer,threatstream/packer,dantran/packer,life360/packer,BayanGroup/packer,mitchellh/packer,qur/packer,tas50/packer,rnaveiras/packer,grubernaut/packer,mafrosis/packer,bensojona/packer,monsterzz/packer,justincampbell/packer,paulmey/packer,rickard-von-essen/packer,gildas/packer-hyperv,pieter-lazzaro/packer,masbog/packer,icnocop/packer,taliesins/packer,fnoeding/packer,esemplare/packer,sean-/packer,jszwedko/packer,zhuzhih2017/packer,sgirones/packer,bryson/packer,ChrisLundquist/packer,routelastresort/packer,orivej/packer,rodm/packer,ChrisLundquist/packer,mgk/packer,tracyde/packer,mohae/packer,KohlsTechnology/packer,mohae/packer,ober/packer,tb3088/packer,dayglojesus/packer,monkeylittleinc/packer,ober/packer,cyberhouse/packer,rrva/packer,bradparks/packer__create_vm_for_aws_docker_vagrant_etc,mindjiver/packer,bhcleek/packer,styro/packer,rk295/packer,beni55/packer,Xiol/packer,pvanbuijtene/packer,Sheile/packer,tsmolka/packer,sgirones/packer,sneal/packer,vtolstov/packer,sneal/packer,mkuzmin/packer,dantran/packer,rnaveiras/packer,henrysher/packer,yonglehou/packer,blairham/packer,legal90/packer,mafrosis/packer,jszwedko/packer,grubernaut/packer,sneal/packer,BayanGroup/packer,BayanGroup/packer,samdunne/packer,danschaffer/packer,lantrix/packer,jae2/packer,Silver90/packer,mindjiver/packer,jean/packer,zakuro9715/packer,manicai/packer,mwhooker/packer,grubernaut/packer,markpeek/packer,noplay/packer,ChrisLundquist/packer,dantran/packer,sean-/packer,KohlsTechnology/packer,oliviertremblay/packer,paulmey/packer,sean-/packer,timsutton/packer,Silver90/packer,hazelesque/packer,napramirez/packer,c22/packer,kpettijohn/packer,dragon788/packer,kgrvamsi/packer,tas50/packer,kpettijohn/packer,tb3088/packer,dayglojesus/packer,jen20/packer,leroux/packer,napramirez/packer,mohae/packer,Akasurde/packer,esemplare/packer,tb3088/packer,ldejager/packer,Sheile/packer,umang1912/packer,visioncritical/packer,avldya/packer,danschaffer/packer,dragon788/packer,p1-nico/packer,quantang/packer,gildas/packer-hyperv,vtolstov/packer,DualSpark/packer,pvanbuijtene/packer,tsmolka/packer,stagrlee/packer,aneeshusa/packer,icnocop/packer,henrysher/packer,threatstream/packer,noplay/packer,pvandervelde/packer,markpeek/packer,rrva/packer,pvanbuijtene/packer,monsterzz/packer,marc-ta/packer,youhong316/packer,pieter-lazzaro/packer,monsterzz/packer,smaato/packer,mvanholsteijn/packer,hashicorp/packer,mgk/packer,life360/packer,sansb/packer,jen20/packer,paulvollmer/packer,pieter-lazzaro/packer,pecigonzalo/packer,jasonchaffee/packer,life360/packer,pecigonzalo/packer,lantrix/packer,monsterzz/packer,c22/packer,gbarberi/packer,paulvollmer/packer,burnzy/packer,jgkim/packer,DualSpark/packer,jen20/packer,arizvisa/packer,Silver90/packer,KohlsTechnology/packer,pearkes/packer,dave2/packer,marc-ta/packer,kpettijohn/packer,jmptrader/packer,hazelesque/packer,dragon788/packer,marklap/packer,Akasurde/packer,grange74/packer,mkuzmin/packer,p1-nico/packer,jae2/packer,zhuzhih2017/packer,vtolstov/packer,c22/packer,mvanholsteijn/packer,arizvisa/packer,ober/packer,qur/packer,smaato/packer,c22/packer,ChrisLundquist/packer,grange74/packer,KFishner/packer,smaato/packer,monkeylittleinc/packer,gbarberi/packer,Xiol/packer,routelastresort/packer,AlphaStaxLLC/packer,jean/packer,markpeek/packer,shaunduncan/packer,ChrisLundquist/packer,ephemeralsnow/packer,visioncritical/packer,pieter-lazzaro/packer,sequenceiq/packer,zakuro9715/packer,boumenot/packer,dev-head/packer,orivej/packer,uber/packer,mgk/packer,dave2/packer,ephemeralsnow/packer,shaunduncan/packer,markpeek/packer,zhuzhih2017/packer,beni55/packer,bensojona/packer,leroux/packer,icnocop/packer,Cbeck527/packer,timsutton/packer,pieter-lazzaro/packer,timsutton/packer,smaato/packer,rrva/packer,dantran/packer,DualSpark/packer,rodm/packer,BayanGroup/packer,bhcleek/packer,boumenot/packer,ephemeralsnow/packer,leroux/packer,jsternberg/packer,jamesleech/packer,yoctocloud/packer,jasonchaffee/packer,marklap/packer,bhcleek/packer,trumant/packer,napramirez/packer,smaato/packer,samdunne/packer,rodm/packer,dragon788/packer,atlassian/packer,btd/packer,dave2/packer,ricardclau/packer,stagrlee/packer,stagrlee/packer,jgkim/packer,kgrvamsi/packer,danschaffer/packer,zhuzhih2017/packer,Sheile/packer,threatstream/packer,btd/packer,umang1912/packer,smaato/packer,jamesbishopp/packer,pvandervelde/packer,monkeylittleinc/packer,visioncritical/packer,rodm/packer,jonathankarsh/packer,fnoeding/packer,c22/packer,Cbeck527/packer,lantrix/packer,sansb/packer,kgrvamsi/packer,hashicorp/packer,blairham/packer,zakuro9715/packer,ephemeralsnow/packer,ricardclau/packer,qur/packer,eranchetz/packer,paulmey/packer,manicai/packer,pvandervelde/packer,gildas/packer-hyperv,mitchellh/packer,styro/packer,mayflower/packer,Cbeck527/packer,tsmolka/packer,aneeshusa/packer,atlassian/packer,AlphaStaxLLC/packer,pieter-lazzaro/packer,icnocop/packer,mvanholsteijn/packer,uber/packer,yoctocloud/packer,sequenceiq/packer,yoctocloud/packer,justincampbell/packer,KFishner/packer,routelastresort/packer,rnaveiras/packer,dantran/packer,mefellows/packer,mayflower/packer,legal90/packer,mefellows/packer,uber/packer,higebu/packer,mayflower/packer,Xiol/packer,tb3088/packer,jmptrader/packer,feateds/packer,taliesins/packer,atlassian/packer,tas50/packer,gildas/packer-hyperv,rnaveiras/packer,bryson/packer,LinusU/packer,Cbeck527/packer,DualSpark/packer,life360/packer,mitchellh/packer,arizvisa/packer,noplay/packer,mafrosis/packer,youhong316/packer,mitchellh/packer,hasJackb/packer,timsutton/packer,zakuro9715/packer,jae2/packer,marklap/packer,sgirones/packer,atlassian/packer,hazelesque/packer,masbog/packer,samdunne/packer,taliesins/packer,jimmythedog/packer,marc-ta/packer,quantang/packer,shaunduncan/packer,tb3088/packer,israelshirk/packer,KohlsTechnology/packer,dave2/packer,grubernaut/packer,tracyde/packer,trumant/packer,feateds/packer,youhong316/packer,tomwilkie/packer,ChrisLundquist/packer,mwhooker/packer,rickard-von-essen/packer,jszwedko/packer,jamesbishopp/packer,mwhooker/packer,ldejager/packer,mkuzmin/packer,grange74/packer,sansb/packer,timsutton/packer,israelshirk/packer,dev-head/packer,taliesins/packer,ephemeralsnow/packer,sean-/packer,fnoeding/packer,manicai/packer,rickard-von-essen/packer,sobrinho/packer,kpettijohn/packer,feateds/packer,yonglehou/packer,beni55/packer,aneeshusa/packer,bensojona/packer,leroux/packer,pearkes/packer,sobrinho/packer,sean-/packer,jean/packer,Banno/packer,hashicorp/packer,jmptrader/packer,jimmythedog/packer,routelastresort/packer,jmptrader/packer,jimmythedog/packer,tomwilkie/packer,danschaffer/packer,esemplare/packer,dev-head/packer,monkeylittleinc/packer,masbog/packer,evertrue/packer,timsutton/packer,p1-nico/packer,jimmythedog/packer,pvandervelde/packer,sobrinho/packer,btd/packer,zeliff/packer,israelshirk/packer,jsternberg/packer,stagrlee/packer,rnaveiras/packer,ricardclau/packer,quantang/packer,rk295/packer,danschaffer/packer,mansunkuo/packer,israelshirk/packer,mkuzmin/packer,KohlsTechnology/packer,ober/packer,jarl-dk/packer,legal90/packer,dayglojesus/packer,jgkim/packer,blairham/packer,avldya/packer,grange74/packer,hazelesque/packer,zeliff/packer,sequenceiq/packer,orivej/packer,dieu/packer,bhcleek/packer,kgrvamsi/packer,masbog/packer,jamesleech/packer,cyberhouse/packer,atlassian/packer,feateds/packer,bhcleek/packer,pvandervelde/packer,ricardclau/packer,Akasurde/packer,Cbeck527/packer,yoctocloud/packer,atlassian/packer,youhong316/packer,sean-/packer,uber/packer,yonglehou/packer,legal90/packer,mitchellh/packer,tomwilkie/packer,p1-nico/packer,jen20/packer,tracyde/packer,vtolstov/packer,life360/packer,hasJackb/packer,tas50/packer,tsmolka/packer,jasonchaffee/packer,dayglojesus/packer,tb3088/packer,mkuzmin/packer,mkuzmin/packer,arizvisa/packer,lantrix/packer,jonathankarsh/packer,AlphaStaxLLC/packer,mohae/packer,tsmolka/packer,jimmythedog/packer,tsmolka/packer,jsternberg/packer,Akasurde/packer,ttaylor249/packer,sneal/packer,higebu/packer