Unsupported module driver not logged correctly

If an invalid module driver is found, the method is erroneously
printed out instead of the actual 'type.'  This is due
to missing parenthesis in the logging call.

This has been fixed.

Change-Id: I6fb23b3dbbec98de9ee1e2731bcfc56ab3c0ca42
Closes-Bug: #1579900

releasenotes/notes/fix_module_driver_logging-666601f411db784a.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - An invalid module driver is now logged correctly.
+    Bug 1579900

trove/guestagent/module/driver_manager.py

@@ -69,7 +69,7 @@ class ModuleDriverManager(object):
                 supported = True
             else:
                 LOG.info(_("Driver '%s' not supported, skipping"),
-                         driver.get_type)
+                         driver.get_type())
         except AttributeError as ex:
             LOG.exception(_("Exception loading module driver: %s"),
                           encodeutils.exception_to_unicode(ex))