rhbz#1140057 don't run auto-attach if pool is specified

currently we always run auto-attach with subscription-manager.
we should only run it if we don't have a pool.

Signed-off-by: Mike Burns <mburns@redhat.com>
Merge pull request #86 from mburns72h/auto-attach

rhbz#1140057 don't run auto-attach if pool is specified