equipment_id for merged configs and routed nodes

Add a new custom module property 'original_id' indicating
the equipment_id the modules originally belongs to.
This property is only given, when distinct from the equipment_id
of the SEC node.
It happens when multiple config files are given, for all modules
but the ones given in the first file, and for routed modules,
when  multiple nodes are routed or own modules are given.

+ fix an issue in router: additional modules were ignore in case
of a single node.

+ small cosmetic changes in config.py reducing IDE complains

Change-Id: If846c47a06158629cef807d22b91f69e4f416563
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/35396
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

frappy/config.py

@@ -56,10 +56,12 @@ class Param(dict):
             kwds['value'] = value
         super().__init__(**kwds)
 
+
 class Group(tuple):
     def __new__(cls, *args):
         return super().__new__(cls, args)
 
+
 class Mod(dict):
     def __init__(self, name, cls, description, **kwds):
         super().__init__(
@@ -70,7 +72,8 @@ class Mod(dict):
 
         # matches name from spec
         if not re.match(r'^[a-zA-Z]\w{0,62}$', name, re.ASCII):
-            raise ConfigError(f'Not a valid SECoP Module name: "{name}". Does it only contain letters, numbers and underscores?')
+            raise ConfigError(f'Not a valid SECoP Module name: "{name}".'
+                              ' Does it only contain letters, numbers and underscores?')
         # Make parameters out of all keywords
         groups = {}
         for key, val in kwds.items():
@@ -85,6 +88,7 @@ class Mod(dict):
             for member in members:
                 self[member]['group'] = group
 
+
 class Collector:
     def __init__(self, cls):
         self.list = []
@@ -120,12 +124,14 @@ class Config(dict):
     def merge_modules(self, other):
         """ merges only the modules from 'other' into 'self'"""
         self.ambiguous |= self.module_names & other.module_names
+        equipment_id = other['node']['equipment_id']
         for name, mod in other.items():
             if name == 'node':
                 continue
             if name not in self.module_names:
                 self.module_names.add(name)
                 self[name] = mod
+                mod['original_id'] = equipment_id
 
 
 def process_file(filename, log):