clean pyc files before running unit tests
clean pyc files before running unit tests

Change-Id: If7ad58f131d8b780125df7ecb5c4081014064f72

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