tool: extend ModuleConfigurer documentation.

Change-Id: I2f4da9a7a2a7917c354137833d66edf0fbc95510
Signed-off-by: Mooli Tayer <mtayer@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/34045
Reviewed-by: Yaniv Bronhaim <ybronhei@redhat.com>
Reviewed-by: Saggi Mizrahi <smizrahi@redhat.com>