Deprecate classes with hyphens

Puppet does not recommend the use of hyphens in class names.

This change deprecates classes with hyphens and inform the users
to use the new ones. Backward compatibility is preserved.

Change-Id: I4991c956e297d76423a805558d9b6731473a4a51
(cherry picked from commit 0f7601a3587511b633d0a04ffa24f42f19b3786c)