ms: Fix and use ms msisdn() getter

The getter method was named the same as the itnernal field, and hence
when used it would fail since the intenral field would be sleect and
fail to be called.

Change-Id: I2f631eb6256eb0e065f41d5b7531395c4a054cd8
diff --git a/sysmocom/suites/debug/interactive.py b/sysmocom/suites/debug/interactive.py
index 3b6a338..18b49d1 100755
--- a/sysmocom/suites/debug/interactive.py
+++ b/sysmocom/suites/debug/interactive.py
@@ -68,14 +68,14 @@
   elif 'sms'.startswith(cmd):
     for mo in modems:
       for mt in modems:
-        mo.sms_send(mt.msisdn, 'to ' + mt.name())
+        mo.sms_send(mt.msisdn(), 'to ' + mt.name())
 
   elif cmd.startswith('call-list'):
       if len(params) != 1 and len(params) != 2:
         print('wrong format')
         continue
       for ms in modems:
-        if len(params) == 1 or str(ms.msisdn) == params[1]:
+        if len(params) == 1 or str(ms.msisdn()) == params[1]:
           print('call-list: %r %r' % (ms.name(), ms.call_id_list()))
 
   elif cmd.startswith('call-dial'):
@@ -84,7 +84,7 @@
       continue
     src_msisdn, dst_msisdn = params[1:]
     for mo in modems:
-      if str(mo.msisdn) == src_msisdn:
+      if str(mo.msisdn()) == src_msisdn:
         print('dialing %s->%s' % (src_msisdn, dst_msisdn))
         call_id = mo.call_dial(dst_msisdn)
         print('dial success: call_id=%r' % call_id)
@@ -95,7 +95,7 @@
       continue
     src_msisdn, dst_msisdn = params[1:]
     for mt in modems:
-      if str(mt.msisdn) == dst_msisdn:
+      if str(mt.msisdn()) == dst_msisdn:
         print('waiting for incoming %s->%s' % (src_msisdn, dst_msisdn))
         call_id = mt.call_wait_incoming(src_msisdn)
         print('incoming call success: call_id=%r' % call_id)
@@ -106,7 +106,7 @@
       continue
     mt_msisdn, call_id = params[1:]
     for mt in modems:
-      if str(mt.msisdn) == mt_msisdn:
+      if str(mt.msisdn()) == mt_msisdn:
         print('answering %s %r' % (mt.name(), call_id))
         mt.call_answer(call_id)
 
@@ -116,7 +116,7 @@
       continue
     ms_msisdn, call_id = params[1:]
     for ms in modems:
-      if str(ms.msisdn) == ms_msisdn:
+      if str(ms.msisdn()) == ms_msisdn:
         print('hanging up %s %r' % (ms.name(), call_id))
         ms.call_hangup(call_id)