Rename ssh_port to connection_port

With the upcoming windows support we don't have ssh as the only
connection type. As a preparation for this generalize ssh_port to
connection_port.

Change-Id: Ie505fedea7b641a860b7ac4f834d96ce5351dd74
Depends-On: Ic1939054f0604411e0122db8dbd7e9886ceaa974
3 files changed