Device support: Provide SSH connection parameters in internal variables.

Example use case: User is developing for embedded Linux system without
an SFTP server. Now deployment can be done via a custom process step
using scp without the need to duplicate all the connection data.

Change-Id: Ib1f71080d106864e5f5345fd36f7cc226a515916
Reviewed-by: hjk <hjk121@nokiamail.com>