MB-12251 Don't log stacktrace on query parse errors

Change-Id: I437f736a9e268244450de0538e93a102b2c2d38e
Reviewed-on: http://review.couchbase.org/42672
Reviewed-by: Volker Mische <volker.mische@gmail.com>
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Sarath Lakshman <sarath@couchbase.com>