Enable consistent-return
Enable consistent-return

This rule enables the "consistent-return" eslint rule from eslint-config-openstack,
and corrects any linting errors found.

http://eslint.org/docs/rules/consistent-return

Change-Id: Icf048ff81d3a1339a27a15c42822c293d335d259

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