AMBARI-21701. Check for org.apache.ambari.metrics.sink.relocated (#1346)

ambari-server/checkstyle.xml

@@ -24,7 +24,7 @@
     <!-- imports -->
     <module name="AvoidStarImport"/>
     <module name="IllegalImport">
-      <property name="illegalPkgs" value="sun, org.apache.hadoop.metrics2.sink.relocated"/>
+      <property name="illegalPkgs" value="sun, org.apache.ambari.metrics.sink.relocated, org.apache.hadoop.metrics2.sink.relocated"/>
     </module>
     <module name="ImportOrder">
       <property name="groups" value="java,javax,org,com,*"/>