Update api_samples README.rst to use tox
Update api_samples README.rst to use tox

./run_tests.py doesn't exist anymore tests are generally run with tox

Change-Id: I290d938b66c21c38b2d7886b5f6a85363c2078c3

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