Refs #5681: Candlepin reset only needs to drop, create and migrate the database.

Previously, we used cpdb and cpsetup to manage the Candlepin database,
cert and configuration file deployment when running Katello reset. With
the installer handling the cert and configuration file, we need only to
drop, create and migrate the Candlepin database when resetting.
Merge pull request #4127 from ehelms/refs-5681

Refs #5681: Candlepin reset only needs to drop, create and migrate the d...