add gearman-plugin project to openstack-infra

Modified zuul, jenkins job builder, gerrit project list and gerrit bot.

Change-Id: I6467f5b1c6fb40e6e186280eefe78d14987bd872
Reviewed-on: https://review.openstack.org/18918
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins
Update Zuul rules for Kwapi project.

Change-Id: I28143c05ae72ff88d7e997b2033822a7067e0919
Reviewed-on: https://review.openstack.org/19389
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: James E. Blair <corvus@inaugust.com>
Reviewed-by: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins