geo-postgresql recipe does not set `hot_standby_feedback` setting

Here is the error in the logs:

2017-04-07_12:56:27.55301 LOG:  syntax error in file "/var/opt/gitlab/geo-postgresql/data/postgresql.conf" line 229, near end of line
2017-04-07_12:56:27.55315 FATAL:  configuration file "/var/opt/gitlab/geo-postgresql/data/postgresql.conf" contains errors

The relevant setting in the conf file:

hot_standby_feedback =    # send info from standby to prevent
          # query conflicts

mentioned in merge request !1460 (merged)

mentioned in issue #2192 (closed)

mentioned in commit 79dec649

added ~13082 label

closed via merge request !1460 (merged)

mentioned in commit tnir/omnibus-gitlab@82158a02