BUILDBOT: Make DeprecationWarnings visible

This allows to more easily detect breakage signs.

buildbot-config/master.cfg

@@ -12,6 +12,10 @@ import importlib
 module_path = os.path.dirname(__file__)
 sys.path.insert(0, module_path)
 
+# Make DeperecationWarnings visible in our code
+import warnings
+warnings.filterwarnings('default', category=DeprecationWarning, module=r'(config|workers|builds|platforms|ui|utils\..*)')
+
 def refresh(directory):
     for module in list(sys.modules.values()):
         try: