cards: use string representation for MNC/MCC

At the moment MNC and MCC are represented as integer numbers inside the
parameter array while all other parameters are represented as strings.
Lets use strings for MNC/MCC as well to simplify the parameter handling.
We will also not loose the length information in case of leading zeros.

Change-Id: Ia2333921a4863f0f26ee923ca796e62ec5e2d59a
diff --git a/pySim-prog.py b/pySim-prog.py
index ee5bc98..9149709 100755
--- a/pySim-prog.py
+++ b/pySim-prog.py
@@ -432,7 +432,7 @@
 	if 'smsp' in params:
 		s.append(" > SMSP     : %(smsp)s")
 	s.append(" > ICCID    : %(iccid)s")
-	s.append(" > MCC/MNC  : %(mcc)d/%(mnc)d")
+	s.append(" > MCC/MNC  : %(mcc)s/%(mnc)s")
 	s.append(" > IMSI     : %(imsi)s")
 	s.append(" > Ki       : %(ki)s")
 	s.append(" > OPC      : %(opc)s")
@@ -483,8 +483,8 @@
 def read_params_csv(opts, imsi=None, iccid=None):
 	row = _read_params_csv(opts, iccid=iccid, imsi=imsi)
 	if row is not None:
-		row['mcc'] = int(row.get('mcc', row['imsi'][0:3]))
-		row['mnc'] = int(row.get('mnc', row['imsi'][3:5]))
+		row['mcc'] = row.get('mcc', row['imsi'][0:3])
+		row['mnc'] = row.get('mnc', row['imsi'][3:5])
 		pin_adm = None
 		# We need to escape the pin_adm we get from the csv
 		if 'pin_adm' in row: