Fix steps reading on Windows

`cat` is not available, so use `type` which does the same thing.

buildbot/master/files/config/factories.py

@@ -57,8 +57,9 @@ def setDefaultWorkdir(self, workdir):
     def run(self):
         self.is_windows = re.match('windows.*', self.builder_name) is not None
         try:
+            show_cmd = "cat" if not self.is_windows else "type"
             cmd = yield self.makeRemoteShellCommand(
-                command=["cat", "./{}".format(self.yaml_path)],
+                command=[show_cmd, "./{}".format(self.yaml_path)],
                 collectStdout=True
             )
             yield self.runCommand(cmd)