Fix support for --flagfile argument
Fix support for --flagfile argument

Recent changes broke support for the --flagfile argument. It would attempt
to find the argument and then pull off the filename portion, but it would
only skip one letter, instead of the full argument name. The resulting
error would be:

Change-Id: Ic252b0c778774a7ea3e24a9ed8b182deb5987f65
OSError: [Errno 2] No such file or directory: 'lagfile=../nova.conf'

petrutlucian94/nova_dev,TwinkleChawla/nova,Francis-Liu/animated-broccoli,paulmathews/nova,houshengbo/nova_vmware_compute_driver,klmitch/nova,psiwczak/openstack,silenceli/nova,maelnor/nova,fajoy/nova,apporc/nova,maoy/zknova,tanglei528/nova,alexandrucoman/vbox-nova-driver,mahak/nova,josephsuh/extra-specs,Metaswitch/calico-nova,NewpTone/stacklab-nova,OpenAcademy-OpenStack/nova-scheduler,phenoxim/nova,belmiromoreira/nova,akash1808/nova,varunarya10/nova_test_latest,kimjaejoong/nova,cyx1231st/nova,yatinkumbhare/openstack-nova,zhimin711/nova,mahak/nova,phenoxim/nova,mandeepdhami/nova,takeshineshiro/nova,usc-isi/extra-specs,ruslanloman/nova,Yusuke1987/openstack_template,badock/nova,devoid/nova,spring-week-topos/nova-week,whitepages/nova,psiwczak/openstack,sebrandon1/nova,psiwczak/openstack,yosshy/nova,zaina/nova,spring-week-topos/nova-week,rrader/nova-docker-plugin,openstack/nova,sacharya/nova,rahulunair/nova,fnordahl/nova,sileht/deb-openstack-nova,rahulunair/nova,Yusuke1987/openstack_template,gspilio/nova,JioCloud/nova,tianweizhang/nova,cloudbase/nova-virtualbox,whitepages/nova,imsplitbit/nova,mikalstill/nova,rickerc/nova_audit,berrange/nova,usc-isi/nova,bigswitch/nova,hanlind/nova,gspilio/nova,rrader/nova-docker-plugin,mandeepdhami/nova,noironetworks/nova,sridevikoushik31/nova,zhimin711/nova,vladikr/nova_drafts,ted-gould/nova,bigswitch/nova,leilihh/novaha,yosshy/nova,rajalokan/nova,maoy/zknova,openstack/nova,sebrandon1/nova,jianghuaw/nova,watonyweng/nova,zzicewind/nova,vmturbo/nova,cloudbau/nova,joker946/nova,Juniper/nova,ewindisch/nova,alexandrucoman/vbox-nova-driver,virtualopensystems/nova,zaina/nova,redhat-openstack/nova,rahulunair/nova,qwefi/nova,mikalstill/nova,dstroppa/openstack-smartos-nova-grizzly,ntt-sic/nova,dims/nova,paulmathews/nova,badock/nova,CiscoSystems/nova,alaski/nova,affo/nova,tealover/nova,isyippee/nova,luogangyi/bcec-nova,fajoy/nova,ted-gould/nova,vladikr/nova_drafts,cernops/nova,scripnichenko/nova,jeffrey4l/nova,plumgrid/plumgrid-nova,orbitfp7/nova,NoBodyCam/TftpPxeBootBareMetal,devendermishrajio/nova_test_latest,viggates/nova,OpenAcademy-OpenStack/nova-scheduler,maelnor/nova,eneabio/nova,Tehsmash/nova,sridevikoushik31/nova,tudorvio/nova,imsplitbit/nova,klmitch/nova,klmitch/nova,eonpatapon/nova,openstack/nova,petrutlucian94/nova_dev,CCI-MOC/nova,maheshp/novatest,angdraug/nova,devoid/nova,noironetworks/nova,plumgrid/plumgrid-nova,gooddata/openstack-nova,jeffrey4l/nova,LoHChina/nova,joker946/nova,mgagne/nova,Juniper/nova,josephsuh/extra-specs,eneabio/nova,barnsnake351/nova,Stavitsky/nova,Juniper/nova,shail2810/nova,angdraug/nova,isyippee/nova,cloudbase/nova,JioCloud/nova_test_latest,usc-isi/nova,edulramirez/nova,tangfeixiong/nova,NoBodyCam/TftpPxeBootBareMetal,BeyondTheClouds/nova,j-carpentier/nova,Yuriy-Leonov/nova,sridevikoushik31/openstack,akash1808/nova_test_latest,double12gzh/nova,usc-isi/nova,ewindisch/nova,yrobla/nova,CEG-FYP-OpenStack/scheduler,SUSE-Cloud/nova,CiscoSystems/nova,yatinkumbhare/openstack-nova,Francis-Liu/animated-broccoli,NewpTone/stacklab-nova,projectcalico/calico-nova,blueboxgroup/nova,akash1808/nova,jianghuaw/nova,thomasem/nova,vmturbo/nova,felixma/nova,saleemjaveds/https-github.com-openstack-nova,JianyuWang/nova,virtualopensystems/nova,citrix-openstack-build/nova,usc-isi/extra-specs,mahak/nova,raildo/nova,sridevikoushik31/openstack,DirectXMan12/nova-hacking,cyx1231st/nova,j-carpentier/nova,Yuriy-Leonov/nova,BeyondTheClouds/nova,felixma/nova,Metaswitch/calico-nova,aristanetworks/arista-ovs-nova,Tehsmash/nova,vmturbo/nova,rajalokan/nova,thomasem/nova,aristanetworks/arista-ovs-nova,mmnelemane/nova,cloudbase/nova-virtualbox,cernops/nova,savi-dev/nova,sridevikoushik31/nova,sebrandon1/nova,DirectXMan12/nova-hacking,bgxavier/nova,devendermishrajio/nova,TieWei/nova,blueboxgroup/nova,maheshp/novatest,rajalokan/nova,shahar-stratoscale/nova,shahar-stratoscale/nova,eayunstack/nova,TwinkleChawla/nova,ruslanloman/nova,Brocade-OpenSource/OpenStack-DNRM-Nova,bgxavier/nova,adelina-t/nova,sridevikoushik31/openstack,tealover/nova,cloudbau/nova,SUSE-Cloud/nova,saleemjaveds/https-github.com-openstack-nova,shootstar/novatest,belmiromoreira/nova,rajalokan/nova,sileht/deb-openstack-nova,varunarya10/nova_test_latest,nikesh-mahalka/nova,yrobla/nova,yrobla/nova,ntt-sic/nova,shail2810/nova,sacharya/nova,dstroppa/openstack-smartos-nova-grizzly,houshengbo/nova_vmware_compute_driver,mgagne/nova,russellb/nova,sridevikoushik31/nova,maheshp/novatest,tudorvio/nova,petrutlucian94/nova,silenceli/nova,klmitch/nova,double12gzh/nova,edulramirez/nova,qwefi/nova,redhat-openstack/nova,scripnichenko/nova,dawnpower/nova,devendermishrajio/nova,mikalstill/nova,rickerc/nova_audit,DirectXMan12/nova-hacking,gspilio/nova,tianweizhang/nova,tangfeixiong/nova,luogangyi/bcec-nova,savi-dev/nova,CloudServer/nova,sileht/deb-openstack-nova,iuliat/nova,watonyweng/nova,adelina-t/nova,kimjaejoong/nova,NoBodyCam/TftpPxeBootBareMetal,cloudbase/nova,TieWei/nova,LoHChina/nova,eayunstack/nova,fajoy/nova,dawnpower/nova,jianghuaw/nova,gooddata/openstack-nova,devendermishrajio/nova_test_latest,CCI-MOC/nova,leilihh/novaha,eharney/nova,houshengbo/nova_vmware_compute_driver,Juniper/nova,eharney/nova,JioCloud/nova_test_latest,zzicewind/nova,raildo/nova,eonpatapon/nova,MountainWei/nova,Triv90/Nova,maoy/zknova,cernops/nova,bclau/nova,NeCTAR-RC/nova,Triv90/Nova,hanlind/nova,gooddata/openstack-nova,alaski/nova,citrix-openstack-build/nova,iuliat/nova,dims/nova,Brocade-OpenSource/OpenStack-DNRM-Nova,Triv90/Nova,JianyuWang/nova,gooddata/openstack-nova,viggates/nova,petrutlucian94/nova,mmnelemane/nova,akash1808/nova_test_latest,NeCTAR-RC/nova,MountainWei/nova,tanglei528/nova,affo/nova,NewpTone/stacklab-nova,leilihh/nova,jianghuaw/nova,dstroppa/openstack-smartos-nova-grizzly,berrange/nova,shootstar/novatest,cloudbase/nova,paulmathews/nova,nikesh-mahalka/nova,alvarolopez/nova,josephsuh/extra-specs,leilihh/nova,CloudServer/nova,usc-isi/extra-specs,russellb/nova,vmturbo/nova,hanlind/nova,JioCloud/nova,aristanetworks/arista-ovs-nova,Stavitsky/nova,takeshineshiro/nova,eneabio/nova,bclau/nova,CEG-FYP-OpenStack/scheduler,apporc/nova,orbitfp7/nova,BeyondTheClouds/nova,savi-dev/nova,projectcalico/calico-nova,fnordahl/nova,russellb/nova,barnsnake351/nova,alvarolopez/nova