fixed tests in test_instance to pass with random PYTHONHASHSEED
fixed tests in test_instance to pass with random PYTHONHASHSEED

order of elements in nova_object.changes field could be changed
from run to run. Sort elements in this field
Partial-Bug: #1348818
Change-Id: I7dc450474c499488b535c202eec47ffd1809fc8e

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