Add an optional parameter to SSHControl so the user can specify
and alternate port to the default (22).
(From OE-Core rev: 091d395e43836575587112ee1696a18c401505bb)
Signed-off-by: Sipke Vriend <sipke.vriend@xilinx.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>