builders: Fix configuration for buildbot 4

Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>

builders.py

@@ -232,7 +232,7 @@ def prioritizeBuilders(master, builders):
                 time = time - builder_bonuses[bldr.name]
                 #log.msg("Adding %s so %s" % (str(builder_bonuses[bldr.name]), str(time)))
 
-        defer.returnValue((time, bldr))
+        return (time, bldr)
 
     transformed = yield defer.gatherResults(
         [transform(bldr) for bldr in builders])

steps/writelayerinfo.py

@@ -41,7 +41,7 @@ class WriteLayerInfo(buildstep.ShellMixin, buildstep.BuildStep):
         cmd = yield self.makeRemoteShellCommand(
             command=writerepos)
         yield self.runCommand(cmd)
-        defer.returnValue(cmd.results())
+        return cmd.results()
 
 
 @defer.inlineCallbacks