MT#63500 skip cdr if failing to acquire contract lock

to avoid rateomat exiting, we now skip a CDR if it fails to
acquire all involved contract row locks rather than bailing out.

Change-Id: Ibbe3b4e0c40008aa033673a7ef3fa98d54945417
(cherry picked from commit 840ccb33f5)

rate-o-mat.pl

@@ -3721,7 +3721,13 @@ sub main {
 					# the whole transaction. thus locking contract rows for preventing
 					# concurrent catchups will be our very first SQL statement in the
 					# billingdb transaction:
-					lock_contracts($cdr);
+					eval { lock_contracts($cdr); };
+					if ($@) {
+						commit_transaction($acctdbh);
+						commit_transaction($billdbh);
+						check_shutdown() and last BATCH;
+						next CDR;
+					}
 					begin_transaction($provdbh);
 					begin_transaction($dupdbh);