workaround for issue controller cannot talk to consumer

The doctor test kick by functest fails in some deployment due to no
connectivity from controller to the doctor consumer.

To avoid this issue, this patch add ssh tunnel from installer node to
the functest contatiner.

JIRA: DOCTOR-63

Change-Id: Ide85137767382a53ebd15b875fd216aeed632705
Signed-off-by: Ryota MIBU <r-mibu@cq.jp.nec.com>