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/doc/examples/2g_osmocom/suites/sms/mo_mt_sms.py b/doc/examples/2g_osmocom/suites/sms/mo_mt_sms.py
index 51e78c0..d7606e4 100755
--- a/doc/examples/2g_osmocom/suites/sms/mo_mt_sms.py
+++ b/doc/examples/2g_osmocom/suites/sms/mo_mt_sms.py
@@ -33,8 +33,8 @@
 ms_mt.log_info()
 
 print('waiting for modems to attach...')
-wait(ms_mo.is_connected, msc.mcc_mnc())
-wait(ms_mt.is_connected, msc.mcc_mnc())
+wait(ms_mo.is_registered, msc.mcc_mnc())
+wait(ms_mt.is_registered, msc.mcc_mnc())
 wait(msc.subscriber_attached, ms_mo, ms_mt)
 
 sms = ms_mo.sms_send(ms_mt)
diff --git a/doc/examples/4g_srsLTE/suites/4g/iperf3_dl.py b/doc/examples/4g_srsLTE/suites/4g/iperf3_dl.py
index d90c80b..d84c078 100755
--- a/doc/examples/4g_srsLTE/suites/4g/iperf3_dl.py
+++ b/doc/examples/4g_srsLTE/suites/4g/iperf3_dl.py
@@ -26,7 +26,7 @@
 proc = iperf3cli.prepare_test_proc(iperf3cli.DIR_DL, ue.netns(), bitrate=max_rate)
 
 print('waiting for UE to attach...')
-wait(ue.is_connected, None)
+wait(ue.is_registered, None)
 print('UE is attached')
 
 print("Running iperf3 client to %s through %s" % (str(iperf3cli), ue.netns()))
diff --git a/doc/examples/4g_srsLTE/suites/4g/iperf3_ul.py b/doc/examples/4g_srsLTE/suites/4g/iperf3_ul.py
index 453cdfa..2592632 100755
--- a/doc/examples/4g_srsLTE/suites/4g/iperf3_ul.py
+++ b/doc/examples/4g_srsLTE/suites/4g/iperf3_ul.py
@@ -26,7 +26,7 @@
 proc = iperf3cli.prepare_test_proc(iperf3cli.DIR_UL, ue.netns(), bitrate=max_rate)
 
 print('waiting for UE to attach...')
-wait(ue.is_connected, None)
+wait(ue.is_registered, None)
 print('UE is attached')
 
 print("Running iperf3 client to %s through %s" % (str(iperf3cli), ue.netns()))
diff --git a/doc/examples/4g_srsLTE/suites/4g/ping.py b/doc/examples/4g_srsLTE/suites/4g/ping.py
index c81a35d..ca35053 100755
--- a/doc/examples/4g_srsLTE/suites/4g/ping.py
+++ b/doc/examples/4g_srsLTE/suites/4g/ping.py
@@ -16,7 +16,7 @@
 
 ue.connect(enb)
 print('waiting for UE to attach...')
-wait(ue.is_connected, None)
+wait(ue.is_registered, None)
 print('UE is attached')
 
 proc = ue.run_netns_wait('ping', ('ping', '-c', '10', epc.tun_addr()))