fix encode/decode of xPLMNwAcT

There are some pretty intricate rules about how GSM and E-UTRAN are
encoded, let's make sure we fully  support both as per 3GPP TS 31.102
Release 17.  As part of this, switch to a sorted list of access technologies,
in order to have a defined order.  This makes comparing in unit tests
much easier.  However, it also means that we need to sort the set
when printing the list of AcT in pySim-read to generate deterministic
output.

Change-Id: I398ac2a2527bd11e9c652e49fa46d6ca8d334b88
diff --git a/pysim-testdata/pySim-trace_test_gsmtap.pcapng.ok b/pysim-testdata/pySim-trace_test_gsmtap.pcapng.ok
index 600c36d..873574c 100644
--- a/pysim-testdata/pySim-trace_test_gsmtap.pcapng.ok
+++ b/pysim-testdata/pySim-trace_test_gsmtap.pcapng.ok
@@ -89,11 +89,11 @@
 ===============================
 00 READ BINARY      MF/ADF.USIM/EF.HPPLMN               -        9000 5
 ===============================
-00 READ BINARY      MF/ADF.USIM/EF.HPLMNwAcT            -        9000 [{'mcc': '001', 'mnc': '01', 'act': ['UTRAN', 'E-UTRAN WB-S1', 'E-UTRAN NB-S1', 'NG-RAN', 'GSM', 'GSM COMPACT', 'cdma2000 HRPD', 'cdma2000 1xRTT']}, None, None, None, None, None, None, None, None, None, None, None]
+00 READ BINARY      MF/ADF.USIM/EF.HPLMNwAcT            -        9000 [{'mcc': '001', 'mnc': '01', 'act': ['E-UTRAN NB-S1', 'E-UTRAN WB-S1', 'EC-GSM-IoT', 'GSM', 'GSM COMPACT', 'NG-RAN', 'UTRAN', 'cdma2000 1xRTT', 'cdma2000 HRPD']}, None, None, None, None, None, None, None, None, None, None, None]
 ===============================
-00 READ BINARY      MF/ADF.USIM/EF.PLMNwAcT             -        9000 [{'mcc': '001', 'mnc': '01', 'act': ['UTRAN', 'E-UTRAN WB-S1', 'E-UTRAN NB-S1', 'NG-RAN', 'GSM', 'GSM COMPACT', 'cdma2000 HRPD', 'cdma2000 1xRTT']}, None, None, None, None, None, None, None, None, None, None, None]
+00 READ BINARY      MF/ADF.USIM/EF.PLMNwAcT             -        9000 [{'mcc': '001', 'mnc': '01', 'act': ['E-UTRAN NB-S1', 'E-UTRAN WB-S1', 'EC-GSM-IoT', 'GSM', 'GSM COMPACT', 'NG-RAN', 'UTRAN', 'cdma2000 1xRTT', 'cdma2000 HRPD']}, None, None, None, None, None, None, None, None, None, None, None]
 ===============================
-00 READ BINARY      MF/ADF.USIM/EF.OPLMNwAcT            -        9000 [{'mcc': '001', 'mnc': '01', 'act': ['UTRAN', 'E-UTRAN WB-S1', 'E-UTRAN NB-S1', 'NG-RAN', 'GSM', 'GSM COMPACT', 'cdma2000 HRPD', 'cdma2000 1xRTT']}, None, None, None, None, None, None, None, None, None, None, None]
+00 READ BINARY      MF/ADF.USIM/EF.OPLMNwAcT            -        9000 [{'mcc': '001', 'mnc': '01', 'act': ['E-UTRAN NB-S1', 'E-UTRAN WB-S1', 'EC-GSM-IoT', 'GSM', 'GSM COMPACT', 'NG-RAN', 'UTRAN', 'cdma2000 1xRTT', 'cdma2000 HRPD']}, None, None, None, None, None, None, None, None, None, None, None]
 ===============================
 00 READ BINARY      MF/ADF.USIM/EF.FPLMN                -        9000 [{'mcc': '262', 'mnc': '01'}, {'mcc': '262', 'mnc': '02'}, {'mcc': '262', 'mnc': '03'}, None]
 ===============================