CCBC-361: Disallow rpm upgrade of individual subpackages

Upgrading a subpackage should upgrade the core as well.

Change-Id: I07c2eac3bbb8278b9781627d14fe7e1e2fb2d5fb
Reviewed-on: http://review.couchbase.org/35510
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Matt Ingenthron <matt@couchbase.com>