Stop using intersphinx
Stop using intersphinx

Remove intersphinx from the docs build as it triggers network calls that
occasionally fail, and we don't really use intersphinx (links other
sphinx documents out on the internet)

This also removes the requirement for internet access during docs build.

This causes docs jobs to fail because we error out on warnings.

Change-Id: I71e941e2a639641a662a163c682eb86d51de42fb
Related-Bug: #1368910

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