PHPC-1076: Allow for extra command output on 3.6 servers

3.6 replica sets may include additional fields in the command response (e.g. operationTime, $clusterTime).

Author: jmikola

tests/apm/monitoring-commandFailed-003.phpt

@@ -48,13 +48,13 @@ try {
 --EXPECTF--
 started: findAndModify
 failed: findAndModify
-object(stdClass)#%d (4) {
+object(stdClass)#%d (%d) {
   ["ok"]=>
   float(0)
   ["errmsg"]=>
   string(49) "Either an update or remove=true must be specified"
   ["code"]=>
   int(9)
   ["codeName"]=>
-  string(13) "FailedToParse"
+  string(13) "FailedToParse"%A
 }