frappy.io, frappy_psi.sea: add basecls to Attached

- this helps to narrow the selection of attached in frappy-edit

Change-Id: I75800d24bdcc1b55bd5303d649a3c4e43d2c3fff

frappy/io.py

@@ -43,7 +43,7 @@ HEX_CODE = re.compile(r'[0-9a-fA-F][0-9a-fA-F]$')
 
 class HasIO(Module):
     """Mixin for modules using a communicator"""
-    io = Attached(mandatory=False)  # either io or uri must be given
+    io = Attached(Communicator, mandatory=False)  # either io or uri must be given
     uri = Property('uri for automatic creation of the attached communication module',
                    StringType(), default='')
 

frappy_psi/sea.py

@@ -479,7 +479,7 @@ def pop_cfg(cfgdict, *args):
 
 
 class SeaModule(Module):
-    io = Attached()
+    io = Attached(SeaClient)
 
     # pylint: disable=too-many-statements,arguments-differ,too-many-branches
     def __new__(cls, name, logger, cfgdict, srv):