[1085270] Unable to install the RHQ server when calling rhqctl outside of bin directory
Fallout from the changes made for 1061311.  This updates the windows
scripts in bin (notably rhqctl.bat) to handle being executed from outside
of bin.
[1065461] readOnly configuration is editable via CLI
Add a new signature to ConfigurationUtility.validateConfiguration that
takes both a newConfiguration and currentConfiguration and ensure the new
config does not alter any non-empty readOnly property value.

Enhance ConfigurationManagerBean.update*Configuration() to perform the new
validation.  Added some tests and updated the Remote method jdoc.