gk-deploy: allow the heketi-service-account to view kubernetes info
gk-deploy: allow the heketi-service-account to view kubernetes info

This is needed as of kubernetes 1.6 which defaults to RBAC
authorization.

Signed-off-by: Michael Adam <dcf2bf3ff8ea93047d51252815aac9756207ea09@redhat.com>

gluster/gluster-kubernetes,ramkrsna/gluster-kubernetes,ramkrsna/gluster-kubernetes,gluster/gluster-kubernetes