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

src/backend/replication/logical/message.c

@@ -31,6 +31,8 @@
 
 #include "postgres.h"
 
+#include "miscadmin.h"
+
 #include "access/xact.h"
 
 #include "catalog/indexing.h"
@@ -60,6 +62,7 @@ LogLogicalMessage(const char *prefix, const char *message, size_t size,
 		GetCurrentTransactionId();
 	}
 
+	xlrec.dbId = MyDatabaseId;
 	xlrec.transactional = transactional;
 	xlrec.prefix_size = strlen(prefix) + 1;
 	xlrec.message_size = size;
@@ -69,6 +72,9 @@ LogLogicalMessage(const char *prefix, const char *message, size_t size,
 	XLogRegisterData((char *) prefix, xlrec.prefix_size);
 	XLogRegisterData((char *) message, size);
 
+	/* allow origin filtering */
+	XLogIncludeOrigin();
+
 	return XLogInsert(RM_LOGICALMSG_ID, XLOG_LOGICAL_MESSAGE);
 }