SockConnTest::testRefused - also check for WSAECONNREFUSED on win32

Change-Id: I7e1fcc1279bd511018b4c62a074e93d0ed0181ac
Reviewed-on: http://review.couchbase.org/36251
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>