gluster: added cluster and host permissions to GlusterAdmin role

Added following host permissions to GlusterAdmin role
-CREATE_CLUSTER
-EDIT_CLUSTER_CONFIGURATION
-DELETE_CLUSTER
-CONFIGURE_CLUSTER_NETWORK
-ASSIGN_CLUSTER_NETWORK

-CREATE_HOST
-EDIT_HOST_CONFIGURATION
-DELETE_HOST
-MANIPUTLATE_HOST
-CONFIGURE_HOST_NETWORK

Change-Id: Ibd5ad6210d1eac3c18d50461025bcdc0364c406c
Bug-Url: https://bugzilla.redhat.com/1024377
Signed-off-by: Kanagaraj M <kmayilsa@redhat.com>