pgsql: Add tab-completion for REASSIGN OWNED BY and DROP OWNED BY.

Log Message:
-----------
Add tab-completion for REASSIGN OWNED BY and DROP OWNED BY.  Also fix some
whitespace issues nearby.

DROP OWNED BY is actually a bit kludgy, but it seems better to do it this way
rather than duplicating the words_after_create list just to add a single
element.

Modified Files:
--------------
    pgsql/src/bin/psql:
        tab-complete.c (r1.149 -> r1.150)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/psql/tab-complete.c.diff?r1=1.149&r2=1.150)