[portsigar] move it forward

i.e. forward to reverts, i.e. backwards :)

Change-Id: I97e26beb0325406cffe958001614ae68eed5d105
Reviewed-on: http://review.couchbase.org/27233
Reviewed-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>
Tested-by: Aliaksey Kandratsenka <alkondratenko@gmail.com>