AMBARI-19893. Mark Druid as Technical Preview. (Nishant Bangarwa via smohanty)

ambari-server/src/main/resources/stacks/HDP/2.6/services/DRUID/metainfo.xml

@@ -22,6 +22,7 @@
       <name>DRUID</name>
       <version>0.9.2.2.6</version>
       <extends>common-services/DRUID/0.9.2</extends>
+      <selection>TECH_PREVIEW</selection>
     </service>
   </services>
 </metainfo>