Fix scheduler_available_filters help
Fix scheduler_available_filters help

The help speaks about nova.scheduler.filters.standard_filters which does
not exist anymore. The default has been changed to all_filters with
commit 0d9ce831 but the help text was not updated so far.

Change-Id: I38dfadabe02489d8d40986e7f4d06c0c68097516

sebrandon1/nova,varunarya10/nova_test_latest,mmnelemane/nova,NeCTAR-RC/nova,akash1808/nova,nikesh-mahalka/nova,dawnpower/nova,nikesh-mahalka/nova,rajalokan/nova,belmiromoreira/nova,tangfeixiong/nova,apporc/nova,adelina-t/nova,joker946/nova,NeCTAR-RC/nova,silenceli/nova,cernops/nova,projectcalico/calico-nova,JioCloud/nova_test_latest,CCI-MOC/nova,fnordahl/nova,barnsnake351/nova,takeshineshiro/nova,mmnelemane/nova,jeffrey4l/nova,eonpatapon/nova,ruslanloman/nova,mikalstill/nova,belmiromoreira/nova,Juniper/nova,apporc/nova,klmitch/nova,openstack/nova,yatinkumbhare/openstack-nova,orbitfp7/nova,Yusuke1987/openstack_template,JioCloud/nova,cloudbase/nova,MountainWei/nova,cernops/nova,hanlind/nova,kimjaejoong/nova,j-carpentier/nova,j-carpentier/nova,whitepages/nova,isyippee/nova,BeyondTheClouds/nova,gooddata/openstack-nova,kimjaejoong/nova,shail2810/nova,ted-gould/nova,whitepages/nova,jeffrey4l/nova,double12gzh/nova,klmitch/nova,thomasem/nova,iuliat/nova,Tehsmash/nova,BeyondTheClouds/nova,Francis-Liu/animated-broccoli,tudorvio/nova,mikalstill/nova,rajalokan/nova,rahulunair/nova,vmturbo/nova,rajalokan/nova,JioCloud/nova,zaina/nova,alvarolopez/nova,raildo/nova,mgagne/nova,alvarolopez/nova,zhimin711/nova,Francis-Liu/animated-broccoli,JianyuWang/nova,rajalokan/nova,projectcalico/calico-nova,cloudbase/nova-virtualbox,MountainWei/nova,mahak/nova,phenoxim/nova,akash1808/nova,tealover/nova,joker946/nova,cloudbase/nova-virtualbox,openstack/nova,varunarya10/nova_test_latest,Metaswitch/calico-nova,orbitfp7/nova,gooddata/openstack-nova,watonyweng/nova,Juniper/nova,CloudServer/nova,blueboxgroup/nova,Metaswitch/calico-nova,alaski/nova,alexandrucoman/vbox-nova-driver,mahak/nova,blueboxgroup/nova,ted-gould/nova,zhimin711/nova,silenceli/nova,JioCloud/nova_test_latest,raildo/nova,Stavitsky/nova,cernops/nova,cyx1231st/nova,BeyondTheClouds/nova,iuliat/nova,openstack/nova,sebrandon1/nova,akash1808/nova_test_latest,dims/nova,devendermishrajio/nova,mandeepdhami/nova,hanlind/nova,TwinkleChawla/nova,rahulunair/nova,barnsnake351/nova,alexandrucoman/vbox-nova-driver,gooddata/openstack-nova,noironetworks/nova,yosshy/nova,klmitch/nova,vmturbo/nova,tealover/nova,edulramirez/nova,cloudbase/nova,CEG-FYP-OpenStack/scheduler,fnordahl/nova,Yusuke1987/openstack_template,jianghuaw/nova,Tehsmash/nova,vmturbo/nova,phenoxim/nova,devendermishrajio/nova_test_latest,LoHChina/nova,devendermishrajio/nova,Stavitsky/nova,scripnichenko/nova,double12gzh/nova,bgxavier/nova,tangfeixiong/nova,eonpatapon/nova,felixma/nova,isyippee/nova,akash1808/nova_test_latest,CloudServer/nova,takeshineshiro/nova,affo/nova,LoHChina/nova,yosshy/nova,edulramirez/nova,CEG-FYP-OpenStack/scheduler,TwinkleChawla/nova,mgagne/nova,zzicewind/nova,Juniper/nova,klmitch/nova,devendermishrajio/nova_test_latest,petrutlucian94/nova,mahak/nova,watonyweng/nova,tudorvio/nova,hanlind/nova,bigswitch/nova,shail2810/nova,rahulunair/nova,JianyuWang/nova,sebrandon1/nova,affo/nova,dims/nova,alaski/nova,mikalstill/nova,bgxavier/nova,CCI-MOC/nova,jianghuaw/nova,bigswitch/nova,thomasem/nova,cyx1231st/nova,vmturbo/nova,mandeepdhami/nova,adelina-t/nova,felixma/nova,cloudbase/nova,noironetworks/nova,ruslanloman/nova,gooddata/openstack-nova,yatinkumbhare/openstack-nova,scripnichenko/nova,zzicewind/nova,dawnpower/nova,jianghuaw/nova,jianghuaw/nova,Juniper/nova,zaina/nova,petrutlucian94/nova