Made the ivy.xml at shep root read-only for clarification
Made the ivy.xml at shep root read-only for clarification

The ivy.xml at shep root shouldn't be modified.
Now developers/users gets a warning when they try
to.

HADOOP-183
splunk/splunk-shuttl,splunk/splunk-shuttl,splunk/splunk-shuttl,splunk/splunk-shuttl,splunk/splunk-shuttl,splunk/splunk-shuttl