delete python bytecode before every test run
delete python bytecode before every test run

Bring over the cleaning line from run_tests.sh for the pyc files to
all the tox runs.

This should eliminate the need to clean -x -i to kill pyc files in
your local directory to get tests to pass.

Closes-Bug: #1368661

Change-Id: Idf3a46d8c95806f2d2ce28ce84ced12b625e53df

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