Add simple VACUUM progress reporting.

Robert Haas <rhaas@postgresql.org>

Commit: c16dc1aca5e01e6acaadfcf38f5fc964a381dc62
Author: Robert Haas <rhaas@postgresql.org>
Date: 2016-03-15T17:32:56Z
Releases: 9.6.0
Add simple VACUUM progress reporting.

There's a lot more that could be done here yet - in particular, this
reports only very coarse-grained information about the index vacuuming
phase - but even as it stands, the new pg_stat_progress_vacuum can
tell you quite a bit about what a long-running vacuum is actually
doing.

Amit Langote and Robert Haas, based on earlier work by Vinayak Pokale
and Rahila Syed.

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