hnb: Introduce HNB_Tests testsuite

A new Iuh CodecPort + Emulation is introduced to (de)mux RANAP and RUA
in the same SCTP socket.
The Iuh_CodecPort.ttcn file has currently a hack to be able to test
HNBAP, since titan seem to be reporting sinfo_ppid=0 when in fact it
received sinfo_ppid=20 (HNBAP).

A couple tests are added to validate HNBAP HNBRegister Request  + Accept
or Reject. In current osmo-hnodeb state, both tests pass if run
separately, but fail if run sequentially since osmo-hnodeb still doesn't
re-connect properly after first test finishes and connection is dropped.

Related: SYS#5516
Change-Id: I7227917148e98a2c777f4b05d8d2eca6e9c121b7
diff --git a/hnodeb/expected-results.xml b/hnodeb/expected-results.xml
new file mode 100644
index 0000000..39cea9f
--- /dev/null
+++ b/hnodeb/expected-results.xml
@@ -0,0 +1,4 @@
+<?xml version="1.0"?>
+<testsuite name='HNB_Tests' tests='0' failures='0' errors='0' skipped='0' inconc='0' time='MASKED'>
+
+</testsuite>