Removing sahara specific exception ref
Removing sahara specific exception ref

Lingering code removal of exception class handling. Already
merged into sahara-dashboard.

Change-Id: Id0d413623574b474a3aef75c2f1e18c35089236f

davidcusatis/horizon,ChameleonCloud/horizon,openstack/horizon,noironetworks/horizon,Tesora/tesora-horizon,dan1/horizon-x509,redhat-openstack/horizon,ChameleonCloud/horizon,redhat-openstack/horizon,bac/horizon,BiznetGIO/horizon,bigswitch/horizon,django-leonardo/horizon,yeming233/horizon,coreycb/horizon,redhat-openstack/horizon,django-leonardo/horizon,davidcusatis/horizon,django-leonardo/horizon,wolverineav/horizon,redhat-openstack/horizon,Mirantis/mos-horizon,dan1/horizon-x509,bac/horizon,bigswitch/horizon,coreycb/horizon,gerrive/horizon,yeming233/horizon,NeCTAR-RC/horizon,redhat-cip/horizon,BiznetGIO/horizon,redhat-cip/horizon,openstack/horizon,noironetworks/horizon,BiznetGIO/horizon,Mirantis/mos-horizon,noironetworks/horizon,gerrive/horizon,coreycb/horizon,gerrive/horizon,bac/horizon,sandvine/horizon,davidcusatis/horizon,dan1/horizon-x509,NeCTAR-RC/horizon,redhat-cip/horizon,sandvine/horizon,bigswitch/horizon,wolverineav/horizon,yeming233/horizon,yeming233/horizon,dan1/horizon-x509,wolverineav/horizon,Mirantis/mos-horizon,Mirantis/mos-horizon,sandvine/horizon,wolverineav/horizon,ChameleonCloud/horizon,django-leonardo/horizon,gerrive/horizon,bac/horizon,Tesora/tesora-horizon,NeCTAR-RC/horizon,BiznetGIO/horizon,openstack/horizon,NeCTAR-RC/horizon,redhat-cip/horizon,bigswitch/horizon,Tesora/tesora-horizon,ChameleonCloud/horizon,coreycb/horizon,Tesora/tesora-horizon,noironetworks/horizon,openstack/horizon,davidcusatis/horizon,sandvine/horizon