Use regular table class for templat page

Switch to regular table class for the template page to avoid
having to make table CSS by hand. Also prevent template from
being disassociated from a tenant while the heat stack is still
being deleted.

Closes-Bug: BVS-2414
Closes-Bug: BVS-2397
(cherry picked from commit 5fd32340aff99999452d090117a322c3e14532fa)