Remove duplicate unused templates
Fix out of date template

The rundeck-config.properties.template file was not updated in the right
location.  Removed old template files and updated correct template
Fix incorrect configuration of plugin manager

If rdeck.config was not set in rundeck config file, then the plugin
manager used for Notification plugins was initialized with an invalid
plugin libext path, and would create a '[:]' directory.

* Require either config file or system property definition of 'rdeck.base'
inside the spring resources script, otherwise bean definitions used by
the notification plugin system will not be created.
* update NotificationService to handle a missing plugin registry