Fix automated tests

- The .ok files currently dictate in which pysical reader device the
card must be placed. Lets remove this dependncy to make the setup more
reliable. Testing in which reade a card is placed is not in the scope of
our tests.

- Fix bug in pysim-test.sh (test runner), so that the veriable $ADM_HEX
gets reset after the execution of the tests.

Change-Id: I12e6b46787efb39c5745f4e7f3cdcca9209881b8
diff --git a/pysim-testdata/Wavemobile-SIM.ok b/pysim-testdata/Wavemobile-SIM.ok
index 5f5b360..b0ea8be 100644
--- a/pysim-testdata/Wavemobile-SIM.ok
+++ b/pysim-testdata/Wavemobile-SIM.ok
@@ -1,4 +1,4 @@
-Using PC/SC reader (dev=3) interface
+Using PC/SC reader (dev=4) interface
 Reading ...
 ICCID: 89445310150011013678
 IMSI: 001010000000102