Add required database and origin filtering for logical messages.

Andres Freund <andres@anarazel.de>

Commit: be65eddd80093a923b091dc60776aa6f966d1f07
Author: Andres Freund <andres@anarazel.de>
Date: 2016-04-14T00:38:54Z
Releases: 9.6.0
Add required database and origin filtering for logical messages.

Logical messages, added in 3fe3511d05, during decoding failed to filter
messages emitted in other databases and messages emitted "under" a
replication origin the output plugin isn't interested in.

Add tests to verify that both types of filtering actually work. While
touching message.sql remove hunk obsoleted by d25379e.

Bump XLOG_PAGE_MAGIC because xl_logical_message changed and because
3fe3511d05 had omitted doing so. 3fe3511d05 additionally didn't bump
catversion, but 7a542700d has done so since.

Author: Petr Jelinek
Reported-By: Andres Freund
Discussion: 20160406142513.wotqy3ba3kanr423@alap3.anarazel.de

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