As a followup to the removal of multipass logic in commit 813b817c:

* Make sure that recovery.conf file does not exist after promotion.
  The file is renamed to recovery.done, like in upstream.

* Update gp_segment_configuration after promotion only if we are a
  master's standby.

* We can't actually access the catalog without some more
  initialization. Pull as much initialization from the old Pass4 as
  possible -- some of it is likely not needed, but this seems to get
  things working for now.

Author: Asim R P <apraveen@pivotal.io>
Author: Jacob Champion <pchampion@pivotal.io>