adding a mask for destination and source ip addresses

adding a mask for destination and source ip addresses

- when using sal services to add the flows, http resposne 400 is
  returned with the message of not matching the regexp pattern
  where the mask is included
- this changes will not impact verify nor integration robot
  suites, because these files are not used there

Change-Id: I5fe4feeecc0ee4cdcdffc63ba9d0721a5c05a0a4
Signed-off-by: Peter Gubka <pgubka@cisco.com>