tests: Replace 'suite' with 'tenv'

Change-Id: I777ec59ffd83b861ddc09e85e52d7a8896264b8c
diff --git a/sysmocom/suites/nitb_netreg_mass/register_default_mass.py b/sysmocom/suites/nitb_netreg_mass/register_default_mass.py
index 262b271..f6b94ad 100644
--- a/sysmocom/suites/nitb_netreg_mass/register_default_mass.py
+++ b/sysmocom/suites/nitb_netreg_mass/register_default_mass.py
@@ -7,11 +7,11 @@
 from datetime import timedelta
 
 print('Claiming resources for the test')
-nitb = suite.nitb()
-bts = suite.bts()
-ms_driver = suite.ms_driver()
+nitb = tenv.nitb()
+bts = tenv.bts()
+ms_driver = tenv.ms_driver()
 ul = ms_driver.add_test('ul_test')
-modems = suite.all_resources(suite.modem)
+modems = tenv.all_resources(tenv.modem)
 
 print('Launching a simple network')
 nitb.bts_add(bts)