Updated development.environment.rst
Updated development.environment.rst

Enhanced the discussion of tools/install_venv.py to say that it
installs the items listed in test-requirements.txt as well as
those listed in requirements.txt.

Re-wrapped the relevant paragraph.

Since the change to delete run_tests.sh and tools/install_venv.py
(https://review.openstack.org/#/c/76627/)
has been abandoned, the doc of install_venv.py should still be
accurate.

Change-Id: I5cfd9f179f40b2418129067d0940bfdbf47512cb
Closes-Bug: #1266671

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