'Import the plugin ``loading_point_filename`` and attach to the plugin bunch.
Plugin bunches are decorated with:
* name : the plugin name
* path : the plugin path
* module : the plugin code
:type   plugin_path:    string
:param  plugin_path:    relative or absolute filesystem path to the plugin
:rtype:                 ``util.bunch.Bunch``
:returns:               the loaded plugin object'

def load_plugin(self, plugin_path):

    plugin = super(HookPluginManager, self).load_plugin(plugin_path)
    loading_point_name = self.loading_point_filename[:(-3)]
    plugin['module'] = self.import_plugin_module(loading_point_name, plugin)
    return plugin
