server: less verbosity on normal flow

only print debug error if there is an unexpected error when starting the
server (we expect an error when opening the socket, ie. the port is
already used).

Author: math2001

server.py

@@ -119,7 +119,9 @@ def start(cls):
             assert "details" in infos, "expected 'details' field in {}".format(infos)
             assert "context" in infos, "expected 'context' field in {}".format(infos)
 
-            print("JSONComma:", infos)
+            if infos["context"] != "opening socket":
+                print("JSONComma: unexpected error trying to open new server", infos)
+
             print("JSONComma: assume already running")
             return