AMBARI-6548. Ubuntu should use HDP-UTILS-1.1.0.18 rather than HDP-UTILS-1.1.0.17 (aonishuk)

ambari-server/src/main/resources/stacks/HDP/2.1/repos/repoinfo.xml

@@ -60,8 +60,8 @@
       <reponame>HDP</reponame>
     </repo>
     <repo>
-      <baseurl>http://public-repo-1.hortonworks.com/HDP-UTILS-1.1.0.17/repos/ubuntu12</baseurl>
-      <repoid>HDP-UTILS-1.1.0.17</repoid>
+      <baseurl>http://public-repo-1.hortonworks.com/HDP-UTILS-1.1.0.18/repos/ubuntu12</baseurl>
+      <repoid>HDP-UTILS-1.1.0.18</repoid>
       <reponame>HDP-UTILS</reponame>
     </repo>
   </os>