further fixes of py3 issues

complaints by pylint are mainly related to
- remove object from base list in class definitions
- unnecessary else/elif after return/raise

Change-Id: I13d15449149cc8bba0562338d0c9c42e97163bdf
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/21325
Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

secop/simulation.py

@@ -30,7 +30,7 @@ from secop.lib import mkthread
 from secop.modules import Drivable, Module, Parameter, Readable, Writable
 
 
-class SimBase(object):
+class SimBase:
     def __init__(self, cfgdict):
         # spice up parameters if requested by extra property
         # hint: us a comma-separated list if mor than one extra_param