remsim-apitool.py: pass IDs as integer

currently the bankId, clientId, and slotNr are passed as strings.
this is not the format expected by the server, which returns 400
"Bad Request".
the issue was that the python tool did not parse the arguments as
integer.

Change-Id: I8baab1b516067f47a7d230213e44d8f85e6d9919
diff --git a/contrib/remsim-apitool.py b/contrib/remsim-apitool.py
index 7662ae4..50f0e72 100755
--- a/contrib/remsim-apitool.py
+++ b/contrib/remsim-apitool.py
@@ -69,7 +69,7 @@
     group.add_argument("-c", "--show-clients",   help="show clients         (GET /clients)",nargs='?',const="all",default=None)
     group.add_argument("-b", "--show-banks",     help="show banks           (GET /banks)",nargs='?',const="all",default=None)
     group.add_argument("-s", "--show-slotmaps",  help="show slotmaps        (GET /slotmaps)",nargs='?',const="all",default=None)
-    group.add_argument("-m", "--create-slotmap", help="create new slotmap   (POST /slotmaps)",nargs=4,metavar=('bank_id', 'bank_slot','client_id','client_slot'))
+    group.add_argument("-m", "--create-slotmap", help="create new slotmap   (POST /slotmaps)", type=int, nargs=4,metavar=('bank_id', 'bank_slot','client_id','client_slot'))
     group.add_argument("-d", "--delete-slotmap", help="delete slotmapping   (DELETE /slotmaps/<id>)", type=int, nargs=2, metavar=('bank_id','bank_slot'))
     group.add_argument("-a", "--show-all",       help="show all (default if no argument given)", action="store_true")