Fix for #105: Updated HadoopSecurityManager_H_2_0.java and ant build file

This PR includes the updated HadoopSecurityManager_H_2_0.java and moved a few classes in azkaban.security.commons to its own directory so they can be used in both hadoopsecuritymanager and hadoopsecuritymanager-yarn.
The configuration property hive.metastore.local was deprecated before the release of Hive 0.10. The value of this configuration property has no impact on Hive or the Hive Metastore. We need to look at hive.metastore.uris instead: https://cwiki.apache.org/confluence/display/Hive/AdminManual+MetastoreAdmin