remove 'maxage' argument for read_* methods

'maxage' is not really used at any place. remove it, as this makes
the code cleaner

Change-Id: I6f10b4ab91fc57640336db1832716ca9012eb241
Reviewed-on: https://forge.frm2.tum.de/review/20347
Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

secop/modules.py

@@ -352,7 +352,7 @@ class Drivable(Writable):
     # improved polling: may poll faster if module is BUSY
     def pollParams(self, nr=0):
         # poll status first
-        self.read_status(0)
+        self.read_status()
         fastpoll = self.isBusy()
         for pname, pobj in self.parameters.items():
             if not pobj.poll: