Remove `utils.parse_mailmap`
Remove `utils.parse_mailmap`

Hasn't been used since 3456b667c38aa1d439482b9c95838aba6d3d6c5c

Change-Id: I454b5fcebb1cca3852155bdf850eacd84ab01980

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