Rename pg_stat_wal_receiver.conn_info to conninfo.

Fujii Masao <fujii@postgresql.org>

Commit: 60d50769b70ca5030711f70c86d7a2d3bcf34963
Author: Fujii Masao <fujii@postgresql.org>
Date: 2016-07-07T03:59:39Z
Releases: 9.6.0
Rename pg_stat_wal_receiver.conn_info to conninfo.

Per discussion on pgsql-hackers, conninfo is better as the column name
because it's more commonly used in PostgreSQL.

Catalog version bumped due to the change of pg_proc.

Author: Michael Paquier

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