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...
Fixes #5802 - HC update/create using system uuids

Alter Host Collection api update/create actions to accept system uuids.
This is a fix related to hammer-cli-katello commands where some of
the commands take uuids and others take the data base id. This allows
the cli commands to uniformly take uuids.

* also added class_name to relation for system in SystemHostCollection
Merge pull request #4175 from dustint-rh/host_collections_create_take_uuid

Fixes #5802 - HC update/create using system uuids
fixes #6018 - fixes typo in Existing Items, BZ 1103283
Merge pull request #4195 from cfouant/typoContentHost

fixes #6018 - fixes typo in Existing Items, BZ 1103283