module: apply datatype first

if the default value is given before the datatype, the module cannot be
created. Also fixes the remaining errors in issue 4913.

Fixes: 4913
Change-Id: I613576388bc3b9e7a5cdc7aa4d5ea73e549ae167
Reviewed-on: https://forge.frm2.tum.de/review/c/secop/frappy/+/37182
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Alexander Zaft <a.zaft@fz-juelich.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>

frappy/modulebase.py

@@ -449,6 +449,10 @@ class Module(HasAccessibles):
             self.commands[name] = accessible
         if cfg is not None:
             try:
+                # apply datatype first
+                datatype = cfg.pop('datatype', None)
+                if datatype is not None:
+                    accessible.setProperty('datatype', datatype)
                 for propname, propvalue in cfg.items():
                     if propname in {'value', 'default', 'constant'}:
                         # these properties have ValueType(), but should be checked for datatype