Fix incorrect ca arguments for calling ceilometer client
Fix incorrect ca arguments for calling ceilometer client

With ceilometer configured with SSL, Horizon fail to connect to
ceilometer to load the meters(usage data) due to it passed a wrong
of ca argument for ceilometer client. Should use 'cacert' instead
of 'ca_file'.

See ceilometer client:
https://github.com/openstack/python-ceilometerclient/blob/master/ceilometerclient/v2/client.py#L53

Change-Id: I296c61119e07cd2e19079ef62054c5837fa13114
Closes-Bug: #1388764

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