Meta replica does not give any primaryOperationTimeout to primary meta region

When a client is configured to use meta replica, it sends scan request to all meta replicas almost at the same time. Since meta replica contains stale data, if result from one of replica comes back first, the client may get wrong region locations. To fix this, "hbase.client.meta.replica.scan.timeout" is introduced, a client will always send to primary meta region first, wait the configured timeout for reply. If no result is received, it will send request to replica meta regions. The unit for "hbase.client.meta.replica.scan.timeout" is microsecond, the default value is 1000000 (1 second).