Cells: remove redundant check if cells are enabled
Cells: remove redundant check if cells are enabled

The validation of the cells being enabled is done when the
cells_api is loaded. So the checks here are redundant.

TrivialFix

Change-Id: I9b85dd2787b2f5c765c9ce6dc1324efcb208ef30

klmitch/nova,JianyuWang/nova,rajalokan/nova,devendermishrajio/nova,mahak/nova,gooddata/openstack-nova,apporc/nova,alaski/nova,mikalstill/nova,klmitch/nova,scripnichenko/nova,alaski/nova,TwinkleChawla/nova,rahulunair/nova,vmturbo/nova,rajalokan/nova,Juniper/nova,openstack/nova,raildo/nova,cloudbase/nova,MountainWei/nova,jianghuaw/nova,scripnichenko/nova,sebrandon1/nova,sebrandon1/nova,hanlind/nova,NeCTAR-RC/nova,rahulunair/nova,vmturbo/nova,mahak/nova,BeyondTheClouds/nova,yosshy/nova,phenoxim/nova,ted-gould/nova,NeCTAR-RC/nova,jianghuaw/nova,fnordahl/nova,edulramirez/nova,CEG-FYP-OpenStack/scheduler,j-carpentier/nova,zhimin711/nova,Juniper/nova,MountainWei/nova,vmturbo/nova,bigswitch/nova,phenoxim/nova,hanlind/nova,CEG-FYP-OpenStack/scheduler,dims/nova,vmturbo/nova,BeyondTheClouds/nova,dims/nova,Juniper/nova,felixma/nova,Francis-Liu/animated-broccoli,cernops/nova,BeyondTheClouds/nova,ted-gould/nova,noironetworks/nova,noironetworks/nova,CCI-MOC/nova,rahulunair/nova,devendermishrajio/nova,cyx1231st/nova,hanlind/nova,zhimin711/nova,apporc/nova,TwinkleChawla/nova,CCI-MOC/nova,jianghuaw/nova,felixma/nova,rajalokan/nova,sebrandon1/nova,openstack/nova,gooddata/openstack-nova,cyx1231st/nova,openstack/nova,fnordahl/nova,mikalstill/nova,cloudbase/nova,mahak/nova,cloudbase/nova,raildo/nova,jianghuaw/nova,j-carpentier/nova,JianyuWang/nova,mikalstill/nova,cernops/nova,yosshy/nova,rajalokan/nova,cernops/nova,Juniper/nova,gooddata/openstack-nova,bigswitch/nova,edulramirez/nova,Francis-Liu/animated-broccoli,gooddata/openstack-nova,klmitch/nova,klmitch/nova