Add 'Story' to gerrit-change-id CHANGE_ID_AFTER

Treat lines starting with 'Story:' the same as 'Bug:' or 'Issue:'.

Change-Id: I91ac64731104c0976e454d5c60b0ea9de0dd853c
Reviewed-on: https://gerrit.causes.com/23531
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Greg Hurrell <greg@causes.com>