Server/Plugins/Ldap: Fix module name

If the module name contains slashes, python will issue an warning:

> Ldap/config.py:1: RuntimeWarning: Parent module '__Ldap_/root/repo/Ldap/config' not found while handling absolute import
>   from Bcfg2.Server.Plugins.Ldap import LdapConnection, LdapQuery

So we simply use the basename without the file extension for the module name.

src/lib/Bcfg2/Server/Plugins/Ldap.py

@@ -33,7 +33,8 @@ def __init__(self, name, core, plugin):
     def Index(self):
         """ Get the queries from the config file """
         try:
-            module = imp.load_source(safe_module_name('Ldap', self.name),
+            module_name = os.path.splitext(os.path.basename(self.name))[0]
+            module = imp.load_source(safe_module_name('Ldap', module_name),
                                      self.name)
         except:  # pylint: disable=W0702
             err = sys.exc_info()[1]