Default monitoring roles - errata

Simon Riggs <simon@2ndQuadrant.com>

Commit: 76e117dbed8c0fee084fbfc06f15c6c377690f59
Author: Simon Riggs <simon@2ndQuadrant.com>
Date: 2018-01-28T16:14:31Z
Releases: 10.2
Default monitoring roles - errata

25fff40798fc4ac11a241bfd9ab0c45c085e2212 introduced
default monitoring roles. Apply these corrections:

* Allow access to pg_stat_get_wal_senders()
  by role pg_read_all_stats

* Correct comment in pg_stat_get_wal_receiver()
  to show it is no longer superuser-only.

Author: Feike Steenbergen
Reviewed-by: Michael Paquier

Apply to HEAD, then later backpatch to 10

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