Remove merge jobs

Merge upstream commiti[1] to remove redundant functionality.

[1] https://github.com/openstack-infra/config/commit/e04970cc533a009bc4affcaec888d87a113afa88#diff-c42d77a3aca007aa3699c882380f73a5

Change-Id: I29b939bae6042cc0036c207c05a5c410bd4aebf7
Signed-off-by: Paul Belanger <paul.belanger@polybeacon.com>