introduced attached modules

for the module names, use Attach instead of Property,
which get attached modules automatically before calling initModule

Change-Id: Iff1b37828d4345c03a18ed29b9970bea149a812d
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/21885
Tested-by: JenkinsCodeReview <bjoern_pedersen@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

secop/server.py

@@ -33,6 +33,7 @@ from daemon import DaemonContext
 
 from secop.errors import ConfigError
 from secop.lib import formatException, get_class, getGeneralConfig
+from secop.modules import Attached
 
 try:
     import daemon.pidlockfile as pidlockfile
@@ -186,6 +187,12 @@ class Server:
             # also call earlyInit on the modules
             modobj.earlyInit()
 
+        # handle attached modules
+        for modname, modobj in self.modules.items():
+            for propname, propobj in modobj.__class__.properties.items():
+                if isinstance(propobj, Attached):
+                    setattr(modobj, propobj.attrname or '_' + propname,
+                            self.dispatcher.get_module(modobj.properties[propname]))
         # call init on each module after registering all
         for modname, modobj in self.modules.items():
             modobj.initModule()