Rename test module to testenv and update references

Preparation to move current Test class into its own module test from
suite module.

Change-Id: I520bd046cb09042b5567d967f951f050e4e02e85
diff --git a/suites/smpp/esme_ms_sms_transaction.py b/suites/smpp/esme_ms_sms_transaction.py
index a147754..efc244c 100755
--- a/suites/smpp/esme_ms_sms_transaction.py
+++ b/suites/smpp/esme_ms_sms_transaction.py
@@ -6,7 +6,7 @@
 # * When SMS is sent in 'transaction' mode, ESME can send an SMS to an already registered MS.
 # * When SMS is sent in 'transaction' mode, ESME fails to send an SMS to non registered MS.
 
-from osmo_gsm_tester.test import *
+from osmo_gsm_tester.testenv import *
 
 SMPP_ESME_RINVDSTADR = 0x0000000B