HDDS-2202. Remove unused import in OmUtils

Closes #1543

hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/OmUtils.java

@@ -46,7 +46,6 @@ import org.apache.hadoop.hdds.scm.HddsServerUtil;
 import org.apache.hadoop.hdds.server.ServerUtils;
 import org.apache.hadoop.net.NetUtils;
 import org.apache.hadoop.ozone.om.OMConfigKeys;
-import org.apache.hadoop.ozone.om.OMMetadataManager;
 import org.apache.hadoop.ozone.om.helpers.OmKeyInfo;
 import org.apache.hadoop.ozone.om.helpers.RepeatedOmKeyInfo;
 import org.apache.hadoop.ozone.protocol.proto.OzoneManagerProtocolProtos;