command not found errors on unstack

- add lib/ceilometer and lib/heat to source list for when stop_heat
and stop_ceilometer functions are called.
- add lib/tls source to lib/keystone for when is_ssl_enabled_service
function called.

Change-Id: Ief05766e9cfda71fb6392c8a757d04751283414e
Closes-Bug: #1269047
Merge "command not found errors on unstack"
Merge branch 'master' of github.com:openstack-dev/devstack