fix ppms with proxy

- proxy: remote parameter status should overddide datatype from
  ProxyModule.status
- ppms: create PpmsDrivable instead of importing from
  (PpmsBase, Drivable). Order matters for status parameter!
- update cfg files

Change-Id: If8fc263cffb903d8b3c1a93a089dcac3597d13a0
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/30512
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

cfg/ppms_proxy_test_cfg.py

@@ -1,6 +1,6 @@
 Node('filtered.PPMS.psi.ch',
     'filtered PPMS at PSI',
-    'localhost:5002',
+    'tcp://5002',
 )
 
 
@@ -16,6 +16,6 @@ Mod('mf',
     remote_class = 'frappy_psi.ppms.Field',
     io = 'secnode',
 
-    value = Param(min = -0.1, max = 0.1),
-    target = Param(min = -8, max = 8),
+    value = Param(),
+    target = Param(min=-0.1, max=0.1),
 )