pgsql: Make UtilityContainsQuery recurse until it finds a non-utility Q

Make UtilityContainsQuery recurse until it finds a non-utility Query.

The callers of UtilityContainsQuery want it to return a non-utility Query
if it returns anything at all.  However, since we made CREATE TABLE
AS/SELECT INTO into a utility command instead of a variant of SELECT,
a command like "EXPLAIN SELECT INTO" results in two nested utility
statements.  So what we need UtilityContainsQuery to do is drill down
to the bottom non-utility Query.

I had thought of this possibility in setrefs.c, and fixed it there by
looping around the UtilityContainsQuery call; but overlooked that the call
sites in plancache.c have a similar issue.  In those cases it's
notationally inconvenient to provide an external loop, so let's redefine
UtilityContainsQuery as recursing down to a non-utility Query instead.

Noted by Rushabh Lathia.  This is a somewhat cleaned-up version of his
proposed patch.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/bde689f809027422d4c0baaa3e63b69ce5762e2c

Modified Files
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src/backend/optimizer/plan/setrefs.c |    2 +-
src/backend/tcop/utility.c           |   26 ++++++++++++++++++++------
2 files changed, 21 insertions(+), 7 deletions(-)