AMBARI-7099. YARN 2.0.6 service definition should not require Tez (aonishuk)

ambari-server/src/main/resources/stacks/HDP/2.0.6/services/YARN/metainfo.xml

@@ -133,7 +133,6 @@
       
       <requiredServices>
         <service>HDFS</service>
-        <service>TEZ</service>
       </requiredServices>
 
       <configuration-dependencies>