For the downgrading of the SSL setup from 2.12 to 2.11, we
need to be able to SSH into machines while no daemons are
running. Unfortunately currently the only way to obtain
custom-configured SSH ports is by queries. In order to
access this information with daemons being shutdown, this
patch adds the SSH port information to an ssconf file.

This will also be used to simplify some backend calls for
the *SSH* handling in 2.13.

Signed-off-by: Helga Velroyen <helgav@google.com>
Reviewed-by: Petr Pudlak <pudlak@google.com>