Clean up how test env variables are parsed
Clean up how test env variables are parsed

Oslo and cookiecutter and other projects were using
variable to parse test environment vaiables. Let us
do this in Nova

This is copied from 739627bf79619f8 Use cleaner version from
cookiecutter OpenStack template

Change-Id: I4c2b4072981985e7632fc775ffc98216fbfc0508

silenceli/nova,hanlind/nova,jeffrey4l/nova,tanglei528/nova,vmturbo/nova,phenoxim/nova,hanlind/nova,Metaswitch/calico-nova,saleemjaveds/https-github.com-openstack-nova,mikalstill/nova,mmnelemane/nova,vmturbo/nova,cernops/nova,Juniper/nova,projectcalico/calico-nova,Stavitsky/nova,tianweizhang/nova,OpenAcademy-OpenStack/nova-scheduler,BeyondTheClouds/nova,tianweizhang/nova,sebrandon1/nova,watonyweng/nova,devoid/nova,barnsnake351/nova,akash1808/nova,devendermishrajio/nova_test_latest,spring-week-topos/nova-week,gooddata/openstack-nova,Tehsmash/nova,alaski/nova,shail2810/nova,dims/nova,akash1808/nova,scripnichenko/nova,rajalokan/nova,jeffrey4l/nova,yatinkumbhare/openstack-nova,devendermishrajio/nova,eonpatapon/nova,affo/nova,jianghuaw/nova,felixma/nova,alexandrucoman/vbox-nova-driver,apporc/nova,fnordahl/nova,mahak/nova,takeshineshiro/nova,petrutlucian94/nova,NeCTAR-RC/nova,dims/nova,LoHChina/nova,orbitfp7/nova,raildo/nova,petrutlucian94/nova_dev,zaina/nova,shail2810/nova,mmnelemane/nova,ted-gould/nova,rajalokan/nova,adelina-t/nova,CCI-MOC/nova,j-carpentier/nova,luogangyi/bcec-nova,devoid/nova,zhimin711/nova,isyippee/nova,rrader/nova-docker-plugin,openstack/nova,zhimin711/nova,JianyuWang/nova,whitepages/nova,shahar-stratoscale/nova,rajalokan/nova,cloudbase/nova,cernops/nova,Juniper/nova,dawnpower/nova,angdraug/nova,badock/nova,rrader/nova-docker-plugin,watonyweng/nova,sacharya/nova,mikalstill/nova,JianyuWang/nova,Stavitsky/nova,mgagne/nova,cyx1231st/nova,jianghuaw/nova,j-carpentier/nova,joker946/nova,BeyondTheClouds/nova,silenceli/nova,JioCloud/nova_test_latest,CiscoSystems/nova,petrutlucian94/nova,Juniper/nova,tealover/nova,jianghuaw/nova,zaina/nova,Metaswitch/calico-nova,felixma/nova,JioCloud/nova_test_latest,mgagne/nova,phenoxim/nova,edulramirez/nova,leilihh/nova,cloudbase/nova-virtualbox,vladikr/nova_drafts,cloudbase/nova,belmiromoreira/nova,thomasem/nova,takeshineshiro/nova,whitepages/nova,eharney/nova,sebrandon1/nova,leilihh/nova,zzicewind/nova,MountainWei/nova,zzicewind/nova,MountainWei/nova,klmitch/nova,maelnor/nova,tudorvio/nova,gooddata/openstack-nova,klmitch/nova,shahar-stratoscale/nova,spring-week-topos/nova-week,mandeepdhami/nova,yosshy/nova,edulramirez/nova,nikesh-mahalka/nova,fnordahl/nova,bgxavier/nova,devendermishrajio/nova_test_latest,tealover/nova,mikalstill/nova,saleemjaveds/https-github.com-openstack-nova,tangfeixiong/nova,yosshy/nova,viggates/nova,virtualopensystems/nova,ruslanloman/nova,vmturbo/nova,petrutlucian94/nova_dev,mahak/nova,CEG-FYP-OpenStack/scheduler,alvarolopez/nova,tudorvio/nova,maelnor/nova,CiscoSystems/nova,vladikr/nova_drafts,kimjaejoong/nova,barnsnake351/nova,Yusuke1987/openstack_template,noironetworks/nova,affo/nova,redhat-openstack/nova,raildo/nova,blueboxgroup/nova,OpenAcademy-OpenStack/nova-scheduler,openstack/nova,eayunstack/nova,nikesh-mahalka/nova,tangfeixiong/nova,redhat-openstack/nova,sacharya/nova,noironetworks/nova,tanglei528/nova,gooddata/openstack-nova,virtualopensystems/nova,cyx1231st/nova,ewindisch/nova,JioCloud/nova,cloudbase/nova,vmturbo/nova,orbitfp7/nova,scripnichenko/nova,thomasem/nova,varunarya10/nova_test_latest,Juniper/nova,CEG-FYP-OpenStack/scheduler,iuliat/nova,akash1808/nova_test_latest,mandeepdhami/nova,LoHChina/nova,double12gzh/nova,CCI-MOC/nova,blueboxgroup/nova,dawnpower/nova,adelina-t/nova,projectcalico/calico-nova,ewindisch/nova,cernops/nova,akash1808/nova_test_latest,eayunstack/nova,jianghuaw/nova,Francis-Liu/animated-broccoli,sebrandon1/nova,joker946/nova,berrange/nova,belmiromoreira/nova,double12gzh/nova,CloudServer/nova,eharney/nova,yatinkumbhare/openstack-nova,bigswitch/nova,luogangyi/bcec-nova,ted-gould/nova,alaski/nova,rajalokan/nova,CloudServer/nova,gooddata/openstack-nova,NeCTAR-RC/nova,bigswitch/nova,Yusuke1987/openstack_template,klmitch/nova,leilihh/novaha,TwinkleChawla/nova,berrange/nova,kimjaejoong/nova,apporc/nova,hanlind/nova,eonpatapon/nova,rahulunair/nova,TwinkleChawla/nova,devendermishrajio/nova,Tehsmash/nova,rahulunair/nova,mahak/nova,bgxavier/nova,ruslanloman/nova,isyippee/nova,badock/nova,JioCloud/nova,viggates/nova,angdraug/nova,cloudbase/nova-virtualbox,openstack/nova,varunarya10/nova_test_latest,leilihh/novaha,alexandrucoman/vbox-nova-driver,Francis-Liu/animated-broccoli,alvarolopez/nova,iuliat/nova,BeyondTheClouds/nova,rahulunair/nova,klmitch/nova