Fixing the instance boot source
Fixing the instance boot source

An extra comma in the update_launch_source_displayed_fields
brakes the launch instance workflow when the option selected
is "Boot from image (creates new volume)"

Change-Id: I0f02354c8f274990fa5a7e4e2a92007513339f8a
Closes-Bug: #1333484

promptworks/horizon,orbitfp7/horizon,noironetworks/horizon,mrunge/horizon,gerrive/horizon,kfox1111/horizon,wolverineav/horizon,maestro-hybrid-cloud/horizon,eayunstack/horizon,nvoron23/avos,takeshineshiro/horizon,mrunge/horizon_lib,Metaswitch/horizon,Metaswitch/horizon,yeming233/horizon,BiznetGIO/horizon,mrunge/horizon,eayunstack/horizon,openstack/horizon,sandvine/horizon,Dark-Hacker/horizon,agileblaze/OpenStackTwoFactorAuthentication,bac/horizon,izadorozhna/dashboard_integration_tests,flochaz/horizon,philoniare/horizon,karthik-suresh/horizon,dan1/horizon-x509,pranavtendolkr/horizon,zouyapeng/horizon,newrocknj/horizon,Dark-Hacker/horizon,nvoron23/avos,blueboxgroup/horizon,luhanhan/horizon,karthik-suresh/horizon,doug-fish/horizon,BiznetGIO/horizon,idjaw/horizon,RudoCris/horizon,icloudrnd/automation_tools,Mirantis/mos-horizon,NeCTAR-RC/horizon,agileblaze/OpenStackTwoFactorAuthentication,froyobin/horizon,yjxtogo/horizon,mrunge/horizon_lib,newrocknj/horizon,vladryk/horizon,coreycb/horizon,Tesora/tesora-horizon,dan1/horizon-proto,openstack/horizon,ging/horizon,flochaz/horizon,damien-dg/horizon,bac/horizon,liyitest/rr,xinwu/horizon,idjaw/horizon,idjaw/horizon,luhanhan/horizon,henaras/horizon,redhat-openstack/horizon,tsufiev/horizon,dan1/horizon-proto,yjxtogo/horizon,liyitest/rr,NCI-Cloud/horizon,VaneCloud/horizon,ChameleonCloud/horizon,redhat-cip/horizon,FNST-OpenStack/horizon,liyitest/rr,sandvine/horizon,tqtran7/horizon,Dark-Hacker/horizon,Tesora/tesora-horizon,bigswitch/horizon,noironetworks/horizon,bigswitch/horizon,dan1/horizon-proto,aaronorosen/horizon-congress,karthik-suresh/horizon,tsufiev/horizon,CiscoSystems/avos,henaras/horizon,noironetworks/horizon,gerrive/horizon,mdavid/horizon,agileblaze/OpenStackTwoFactorAuthentication,mandeepdhami/horizon,philoniare/horizon,Daniex/horizon,CiscoSystems/avos,Daniex/horizon,CiscoSystems/horizon,j4/horizon,redhat-cip/horizon,Daniex/horizon,idjaw/horizon,FNST-OpenStack/horizon,luhanhan/horizon,blueboxgroup/horizon,JioCloud/horizon,endorphinl/horizon-fork,davidcusatis/horizon,icloudrnd/automation_tools,xme1226/horizon,NCI-Cloud/horizon,zouyapeng/horizon,saydulk/horizon,redhat-openstack/horizon,anthonydillon/horizon,nvoron23/avos,openstack/horizon,CiscoSystems/avos,anthonydillon/horizon,newrocknj/horizon,eayunstack/horizon,CiscoSystems/horizon,mandeepdhami/horizon,Hodorable/0602,mandeepdhami/horizon,newrocknj/horizon,ging/horizon,endorphinl/horizon,NeCTAR-RC/horizon,mrunge/horizon_lib,tellesnobrega/horizon,tsufiev/horizon,watonyweng/horizon,Hodorable/0602,redhat-cip/horizon,django-leonardo/horizon,mandeepdhami/horizon,orbitfp7/horizon,BiznetGIO/horizon,Mirantis/mos-horizon,aaronorosen/horizon-congress,damien-dg/horizon,gerrive/horizon,endorphinl/horizon,ChameleonCloud/horizon,NeCTAR-RC/horizon,mdavid/horizon,henaras/horizon,aaronorosen/horizon-congress,Dark-Hacker/horizon,saydulk/horizon,tqtran7/horizon,CiscoSystems/avos,wangxiangyu/horizon,maestro-hybrid-cloud/horizon,FNST-OpenStack/horizon,wolverineav/horizon,nvoron23/avos,maestro-hybrid-cloud/horizon,mdavid/horizon,wolverineav/horizon,icloudrnd/automation_tools,sandvine/horizon,VaneCloud/horizon,xinwu/horizon,liyitest/rr,froyobin/horizon,vladryk/horizon,anthonydillon/horizon,BiznetGIO/horizon,kfox1111/horizon,doug-fish/horizon,mdavid/horizon,mrunge/openstack_horizon,blueboxgroup/horizon,wangxiangyu/horizon,openstack/horizon,tqtran7/horizon,flochaz/horizon,xme1226/horizon,NCI-Cloud/horizon,kfox1111/horizon,CiscoSystems/horizon,agileblaze/OpenStackTwoFactorAuthentication,froyobin/horizon,endorphinl/horizon-fork,VaneCloud/horizon,xme1226/horizon,tellesnobrega/horizon,coreycb/horizon,mrunge/horizon,tellesnobrega/horizon,Solinea/horizon,JioCloud/horizon,maestro-hybrid-cloud/horizon,Metaswitch/horizon,watonyweng/horizon,Solinea/horizon,redhat-cip/horizon,yjxtogo/horizon,xinwu/horizon,doug-fish/horizon,wangxiangyu/horizon,anthonydillon/horizon,yeming233/horizon,mrunge/openstack_horizon,FNST-OpenStack/horizon,Metaswitch/horizon,tqtran7/horizon,endorphinl/horizon,Solinea/horizon,promptworks/horizon,Hodorable/0602,flochaz/horizon,noironetworks/horizon,pranavtendolkr/horizon,VaneCloud/horizon,ging/horizon,ChameleonCloud/horizon,orbitfp7/horizon,davidcusatis/horizon,xinwu/horizon,vladryk/horizon,saydulk/horizon,RudoCris/horizon,Mirantis/mos-horizon,kfox1111/horizon,redhat-openstack/horizon,endorphinl/horizon-fork,promptworks/horizon,mrunge/openstack_horizon,tellesnobrega/horizon,davidcusatis/horizon,zouyapeng/horizon,gerrive/horizon,dan1/horizon-proto,doug-fish/horizon,saydulk/horizon,ChameleonCloud/horizon,j4/horizon,endorphinl/horizon-fork,Solinea/horizon,django-leonardo/horizon,henaras/horizon,yjxtogo/horizon,JioCloud/horizon,zouyapeng/horizon,dan1/horizon-x509,coreycb/horizon,RudoCris/horizon,blueboxgroup/horizon,Tesora/tesora-horizon,endorphinl/horizon,Mirantis/mos-horizon,NeCTAR-RC/horizon,pranavtendolkr/horizon,watonyweng/horizon,sandvine/horizon,tsufiev/horizon,ging/horizon,philoniare/horizon,orbitfp7/horizon,wangxiangyu/horizon,j4/horizon,damien-dg/horizon,karthik-suresh/horizon,CiscoSystems/horizon,bac/horizon,bac/horizon,davidcusatis/horizon,icloudrnd/automation_tools,dan1/horizon-x509,django-leonardo/horizon,dan1/horizon-x509,RudoCris/horizon,philoniare/horizon,Hodorable/0602,watonyweng/horizon,bigswitch/horizon,luhanhan/horizon,izadorozhna/dashboard_integration_tests,django-leonardo/horizon,vladryk/horizon,damien-dg/horizon,yeming233/horizon,bigswitch/horizon,pranavtendolkr/horizon,promptworks/horizon,j4/horizon,coreycb/horizon,wolverineav/horizon,yeming233/horizon,Tesora/tesora-horizon,takeshineshiro/horizon,takeshineshiro/horizon,NCI-Cloud/horizon,takeshineshiro/horizon,Daniex/horizon,redhat-openstack/horizon