packaging: setup: support non-standard SSH port

Automatically detect the port used by SSH daemon
supporting non-standard SSH port.
The detected port can be manually overridden
setting OVEHOSTED_NETWORK/sshdPort.

Change-Id: Ic3b1264290d7e98d1d84ac2546a078f8941ecf47
Related-To: http://gerrit.ovirt.org/18174
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>