Move trial.py and suite.py to core/

Change-Id: Ic9a4c90c190e9d8e1829fbef83a9243f3c6f655b
diff --git a/src/osmo-gsm-tester.py b/src/osmo-gsm-tester.py
index af66b32..dc1e058 100755
--- a/src/osmo-gsm-tester.py
+++ b/src/osmo-gsm-tester.py
@@ -71,9 +71,10 @@
 from signal import *
 from osmo_gsm_tester import __version__
 from osmo_gsm_tester.core import log
+from osmo_gsm_tester.core import trial
+from osmo_gsm_tester.core import suite
 from osmo_gsm_tester.core.config import read_config_file, DEFAULT_SUITES_CONF
 from osmo_gsm_tester.core.schema import generate_schemas
-from osmo_gsm_tester import trial, suite
 
 def sig_handler_cleanup(signum, frame):
     print("killed by signal %d" % signum)