tests: Replace is_connected() with is_registered()

API was renamed and old name deprecated, let's use it everywhere.

Change-Id: Ic91dddcfd1a5a17c35d15a8a14628b3923229523
diff --git a/sysmocom/suites/gprs/lib/testlib.py b/sysmocom/suites/gprs/lib/testlib.py
index 1421229..510dc72 100644
--- a/sysmocom/suites/gprs/lib/testlib.py
+++ b/sysmocom/suites/gprs/lib/testlib.py
@@ -85,7 +85,7 @@
 
     print('waiting for modems to attach...')
     for ms in ms_li:
-        wait(ms.is_connected, msc.mcc_mnc())
+        wait(ms.is_registered, msc.mcc_mnc())
     wait(msc.subscriber_attached, *ms_li)
 
     print('waiting for modems to attach to data services...')
diff --git a/sysmocom/suites/gprs/ping.py b/sysmocom/suites/gprs/ping.py
index 9a7acde..421aa26 100755
--- a/sysmocom/suites/gprs/ping.py
+++ b/sysmocom/suites/gprs/ping.py
@@ -40,7 +40,7 @@
 ms.log_info()
 
 print('waiting for modems to attach...')
-wait(ms.is_connected, msc.mcc_mnc())
+wait(ms.is_registered, msc.mcc_mnc())
 wait(msc.subscriber_attached, ms)
 
 print('waiting for modems to attach to data services...')
diff --git a/sysmocom/suites/gprs/ping_idle_ping.py b/sysmocom/suites/gprs/ping_idle_ping.py
index 88ecbdb..099650c 100755
--- a/sysmocom/suites/gprs/ping_idle_ping.py
+++ b/sysmocom/suites/gprs/ping_idle_ping.py
@@ -45,7 +45,7 @@
 ms.log_info()
 
 print('waiting for modems to attach...')
-wait(ms.is_connected, msc.mcc_mnc())
+wait(ms.is_registered, msc.mcc_mnc())
 wait(msc.subscriber_attached, ms)
 
 print('waiting for modems to attach to data services...')