add pipelines and update comment filter for gerrit 2.8

In Gerrit 2.4.x stream event, comments contained just the comment.  Gerrit 2.8 appends
the patch id to the comment string.  This change updates the regex to match on the
new string.

gerrit 2.4.x - "comment":"recheck no bug"
gerrit 2.8.x - "comment":"Patch Set 4:\n\nrecheck no bug"

Change-Id: I821ed3a00810623258ea1af90ee864594a65f0df