Have CREATE TABLE AS and REFRESH return an OID

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 301fcf33eb7fcbcf1da113dabeed90b8eaf656eb
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2014-08-25T19:32:18Z
Releases: 9.5.0
Have CREATE TABLE AS and REFRESH return an OID

Other DDL commands are already returning the OID, which is required for
future additional event trigger work.  This is merely making these
commands in line with the rest of utility command support.

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