core: added a debug log when a namespace is registered

sat/core/sat_main.py

@@ -622,6 +622,7 @@ class SAT(service.Service):
         """associate a namespace to a short name"""
         if short_name in self.ns_map:
             raise exceptions.ConflictError("this short name is already used")
+        log.debug(f"registering namespace {short_name} => {namespace}")
         self.ns_map[short_name] = namespace
 
     def getNamespaces(self):