Remove sshd reconfig from lib/ironic

The sshd reconfiguration to listen on port 2222 provides no
benefit and complicates deployment on some systems.  This removes
the reconfiguration and instead just confirms SSH connectivity.
Default SSH host and ports are left configurable, but the port now
reflects the default 22.

Change-Id: Iaf7c71854c3741a505a79037ffb8c86ace74fc27
Merge "Remove sshd reconfig from lib/ironic"