Don't ignore the HORIZON_CONFIG['user_home'] setting
Don't ignore the HORIZON_CONFIG['user_home'] setting

Dashboard has its own splash, with a hardcoded get_user_home that
igonres HORIZON_CONFIG. This patch makes it use horiozn.get_user_home
which actually checks the user_home setting, and with the default
settings.py, uses dashboard's get_user_home anyways, but allows for
changing that default behavior.

Change-Id: Id2d957f0cd8fbbbbb8f2c053f0c5df4be177e18c
Closes-bug: #1301935

VaneCloud/horizon,newrocknj/horizon,bigswitch/horizon,aaronorosen/horizon-congress,icloudrnd/automation_tools,NeCTAR-RC/horizon,endorphinl/horizon-fork,redhat-openstack/horizon,CiscoSystems/horizon,bigswitch/horizon,zouyapeng/horizon,luhanhan/horizon,coreycb/horizon,wolverineav/horizon,watonyweng/horizon,blueboxgroup/horizon,kfox1111/horizon,kfox1111/horizon,flochaz/horizon,yeming233/horizon,tellesnobrega/horizon,eayunstack/horizon,BiznetGIO/horizon,FNST-OpenStack/horizon,spring-week-topos/horizon-week,karthik-suresh/horizon,philoniare/horizon,sandvine/horizon,agileblaze/OpenStackTwoFactorAuthentication,mrunge/openstack_horizon,tanglei528/horizon,RudoCris/horizon,gerrive/horizon,tqtran7/horizon,noironetworks/horizon,CiscoSystems/horizon,nvoron23/avos,yjxtogo/horizon,wangxiangyu/horizon,Solinea/horizon,tsufiev/horizon,sandvine/horizon,idjaw/horizon,VaneCloud/horizon,davidcusatis/horizon,endorphinl/horizon-fork,Tesora/tesora-horizon,wolverineav/horizon,pranavtendolkr/horizon,ging/horizon,icloudrnd/automation_tools,dan1/horizon-x509,j4/horizon,Hodorable/0602,dan1/horizon-proto,django-leonardo/horizon,VaneCloud/horizon,Daniex/horizon,Daniex/horizon,promptworks/horizon,bigswitch/horizon,redhat-cip/horizon,anthonydillon/horizon,endorphinl/horizon,coreycb/horizon,tqtran7/horizon,tellesnobrega/horizon,Hodorable/0602,redhat-openstack/horizon,wolverineav/horizon,endorphinl/horizon,j4/horizon,BiznetGIO/horizon,NeCTAR-RC/horizon,blueboxgroup/horizon,redhat-cip/horizon,JioCloud/horizon,spring-week-topos/horizon-week,Solinea/horizon,henaras/horizon,newrocknj/horizon,yjxtogo/horizon,Hodorable/0602,izadorozhna/dashboard_integration_tests,bac/horizon,endorphinl/horizon,openstack/horizon,agileblaze/OpenStackTwoFactorAuthentication,davidcusatis/horizon,NCI-Cloud/horizon,NeCTAR-RC/horizon,NCI-Cloud/horizon,davidcusatis/horizon,wangxiangyu/horizon,dan1/horizon-proto,FNST-OpenStack/horizon,yeming233/horizon,Dark-Hacker/horizon,promptworks/horizon,liyitest/rr,Dark-Hacker/horizon,anthonydillon/horizon,RudoCris/horizon,Dark-Hacker/horizon,xinwu/horizon,kfox1111/horizon,mandeepdhami/horizon,Daniex/horizon,izadorozhna/dashboard_integration_tests,dan1/horizon-x509,Tesora/tesora-horizon,mrunge/horizon,karthik-suresh/horizon,newrocknj/horizon,doug-fish/horizon,maestro-hybrid-cloud/horizon,noironetworks/horizon,damien-dg/horizon,xme1226/horizon,promptworks/horizon,NeCTAR-RC/horizon,kfox1111/horizon,Mirantis/mos-horizon,Metaswitch/horizon,nvoron23/avos,CiscoSystems/horizon,flochaz/horizon,mrunge/horizon,mdavid/horizon,damien-dg/horizon,VaneCloud/horizon,openstack/horizon,takeshineshiro/horizon,mandeepdhami/horizon,damien-dg/horizon,xinwu/horizon,dan1/horizon-proto,endorphinl/horizon-fork,endorphinl/horizon,bigswitch/horizon,ChameleonCloud/horizon,karthik-suresh/horizon,takeshineshiro/horizon,Mirantis/mos-horizon,django-leonardo/horizon,aaronorosen/horizon-congress,orbitfp7/horizon,Metaswitch/horizon,bac/horizon,zouyapeng/horizon,pranavtendolkr/horizon,henaras/horizon,henaras/horizon,spring-week-topos/horizon-week,openstack/horizon,redhat-openstack/horizon,vladryk/horizon,watonyweng/horizon,Tesora/tesora-horizon,froyobin/horizon,idjaw/horizon,icloudrnd/automation_tools,doug-fish/horizon,vladryk/horizon,RudoCris/horizon,orbitfp7/horizon,dan1/horizon-x509,saydulk/horizon,mrunge/horizon_lib,mdavid/horizon,nvoron23/avos,yjxtogo/horizon,Hodorable/0602,damien-dg/horizon,redhat-cip/horizon,CiscoSystems/avos,philoniare/horizon,FNST-OpenStack/horizon,j4/horizon,ChameleonCloud/horizon,takeshineshiro/horizon,yjxtogo/horizon,froyobin/horizon,tsufiev/horizon,liyitest/rr,promptworks/horizon,tanglei528/horizon,mdavid/horizon,Daniex/horizon,mandeepdhami/horizon,ChameleonCloud/horizon,tqtran7/horizon,saydulk/horizon,mrunge/horizon_lib,xme1226/horizon,luhanhan/horizon,CiscoSystems/avos,luhanhan/horizon,aaronorosen/horizon-congress,xinwu/horizon,watonyweng/horizon,wolverineav/horizon,newrocknj/horizon,philoniare/horizon,maestro-hybrid-cloud/horizon,doug-fish/horizon,froyobin/horizon,Tesora/tesora-horizon,tsufiev/horizon,JioCloud/horizon,NCI-Cloud/horizon,henaras/horizon,BiznetGIO/horizon,tqtran7/horizon,JioCloud/horizon,j4/horizon,dan1/horizon-proto,endorphinl/horizon-fork,watonyweng/horizon,wangxiangyu/horizon,django-leonardo/horizon,tanglei528/horizon,django-leonardo/horizon,nvoron23/avos,pranavtendolkr/horizon,mdavid/horizon,ging/horizon,saydulk/horizon,Mirantis/mos-horizon,liyitest/rr,gerrive/horizon,xinwu/horizon,icloudrnd/automation_tools,mrunge/openstack_horizon,mrunge/horizon_lib,zouyapeng/horizon,noironetworks/horizon,vladryk/horizon,saydulk/horizon,mrunge/openstack_horizon,eayunstack/horizon,luhanhan/horizon,dan1/horizon-x509,gerrive/horizon,coreycb/horizon,flochaz/horizon,xme1226/horizon,tellesnobrega/horizon,ChameleonCloud/horizon,sandvine/horizon,coreycb/horizon,anthonydillon/horizon,philoniare/horizon,CiscoSystems/avos,Metaswitch/horizon,agileblaze/OpenStackTwoFactorAuthentication,Metaswitch/horizon,FNST-OpenStack/horizon,NCI-Cloud/horizon,pranavtendolkr/horizon,idjaw/horizon,mrunge/horizon,ging/horizon,orbitfp7/horizon,Dark-Hacker/horizon,RudoCris/horizon,zouyapeng/horizon,ging/horizon,agileblaze/OpenStackTwoFactorAuthentication,maestro-hybrid-cloud/horizon,doug-fish/horizon,openstack/horizon,gerrive/horizon,blueboxgroup/horizon,maestro-hybrid-cloud/horizon,CiscoSystems/horizon,sandvine/horizon,tsufiev/horizon,CiscoSystems/avos,Solinea/horizon,wangxiangyu/horizon,karthik-suresh/horizon,Mirantis/mos-horizon,orbitfp7/horizon,eayunstack/horizon,blueboxgroup/horizon,bac/horizon,davidcusatis/horizon,redhat-openstack/horizon,takeshineshiro/horizon,yeming233/horizon,tellesnobrega/horizon,BiznetGIO/horizon,anthonydillon/horizon,bac/horizon,idjaw/horizon,noironetworks/horizon,mandeepdhami/horizon,redhat-cip/horizon,Solinea/horizon,flochaz/horizon,liyitest/rr,vladryk/horizon,yeming233/horizon