Merge pull request #2252 from edx/max/update-ubuntu-amis

Update base ubuntu AMIs to newest versions

util/jenkins/ansible-provision.sh

@@ -101,9 +101,9 @@ if [[ -z $ami ]]; then
   if [[ $server_type == "full_edx_installation" ]]; then
     ami="ami-ef862184"
   elif [[ $server_type == "ubuntu_12.04" || $server_type == "full_edx_installation_from_scratch" ]]; then
-    ami="ami-93fb34f8"
+    ami="ami-c15bebaa"
   elif [[ $server_type == "ubuntu_14.04(experimental)" ]]; then
-    ami="ami-c135f3aa"
+    ami="ami-2dcf7b46"
   fi
 fi