Similar to the installer-managed DHCP service (SAT-37669), we support a remote deployed ISC DHCP service. Upstream this is documented in https://docs.theforeman.org/nightly/Integrating_Provisioning_Infrastructure_Services/index-katello.html#integrating-a-remote-isc-dhcp-server.

Acceptance criteria:

• The installer supports this
• The enhanced procedure is documented
• This is tested

QE Tracker for https://issues.redhat.com/browse/SAT-37671