Bug 1560956 - RaptorLogger class should not inherit from ProxyLogger r=perftest-reviewers,sparky

RaptorLogger class is using object composition to create its logger field.
Because the inheritance is not used to achieve that, there is no need to extend ProxyLogger class.

Differential Revision: https://phabricator.services.mozilla.com/D35661

--HG--
extra : moz-landing-system : lando

testing/raptor/logger/logger.py

@@ -9,7 +9,7 @@ from __future__ import absolute_import
 from mozlog.proxy import ProxyLogger
 
 
-class RaptorLogger(ProxyLogger):
+class RaptorLogger():
 
     def __init__(self, component=None):
         self.logger = ProxyLogger(component)