Snapshot creation disabled for Templates

Noted that several VMWare Templates have a snapshot in my database, so only disabled snapshots for RedHat Templates.  This issue seems loosely related: https://github.com/ManageIQ/manageiq/issues/253.

https://bugzilla.redhat.com/show_bug.cgi?id=1005285
From recent conversations on another PR, I'll be going with ```@record.supports_snapshots?```