Add more infinite recursion detection while locking a view.

Tatsuo Ishii <ishii@postgresql.org>

Commit: 03030512d1e4df78dc2543d3fe3b6d13e5cb63f6
Author: Tatsuo Ishii <ishii@postgresql.org>
Date: 2018-04-17T07:59:17Z
Releases: 11.0
Add more infinite recursion detection while locking a view.

Also add regression test cases for detecting infinite recursion in
locking view tests.  Some document enhancements. Patch by Yugo Nagata.

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