Add mock to test-requirements
Add mock to test-requirements

There are several changes which depend on using mock rather than mox for
unit tests:

https://review.openstack.org/#/c/42474/
https://review.openstack.org/#/c/43161/

And the general trend seems to be to move from using mock over mox for
new tests (see blueprint mox-to-mock-conversion).

And given mock is listed in the global-requirements.txt file in the
openstack/requirements project, we should require mock for nova so we
can start using it.

Change-Id: Iaa0f233c28de2f92a237ee6d089858ee10bc6d2f

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