Use JNDI bindings to configure Zanata instead of zanata.properties.

Remove the need for zanata.properties, and in turn for the zanata-settings jboss module. The settings in this file will now be configured in standalone.xml as JNDI bindings. Please look at arquillian.xml to understand the configuration needed for this change. 

After this, the functional-tests module as well as development and test machines will need to be reconfigured.