Initial TTCN-3 test suite for osmo-remsim

This adds shared infrastructure and initial test suites for
osmo-remsim-{server,client,bankd}.

Change-Id: I00034d3a991f0f881cfd8ff0bfc4557113daf830
diff --git a/remsim/REMSIM_Tests.default b/remsim/REMSIM_Tests.default
new file mode 100644
index 0000000..7a41555
--- /dev/null
+++ b/remsim/REMSIM_Tests.default
@@ -0,0 +1,3 @@
+[TESTPORT_PARAMETERS]
+system.HTTP.http_debugging := "yes"
+system.HTTP.use_notification_ASPs := "no"