bsc: inter-BSC HO: add TC_ho_out_of_this_bsc, TC_ho_into_this_bsc

Add f_gen_handover_req() like f_gen_ass_req(), to match AoIP or SCCPlite
requirements.

For incoming HO, MSC_ConnHdlr needs to know the SCCP addresses to expect the
incoming SCCP Connection from MSC to BSC. Add 'handover' section to
TestHdlrParams, and pass in the addresses from test_CT via that.

In osmo-bsc.cfg, add a remote neighbor config, so that the VTY command
'handover any to arfcn 123 bsic any' can trigger an outgoing inter-BSC HO.

Add various BSSMAP handover templates to BSSMAP_Templates.ttcn.
Add RR Ho Command template to L3_Templates.ttcn.

Move ts_BSSAP_Conn_Req() from msc/BSC_ConnectionHandler.ttcn to
library/BSSMAP_Emulation.ttcn, so we can also model an SCCP Connection Request
in BSC_Tests.ttcn (this time from MSC to BSC).

Add the two new tests to bsc/expected-results.xml.

Related: OS#2283
Change-Id: Id22852d4be7f127d827e7a8beeec55db27c07f03
diff --git a/bsc/expected-results.xml b/bsc/expected-results.xml
index 33bc243..64d0444 100644
--- a/bsc/expected-results.xml
+++ b/bsc/expected-results.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0"?>
-<testsuite name='BSC_Tests' tests='89' failures='0' errors='0' skipped='0' inconc='0' time='MASKED'>
+<testsuite name='BSC_Tests' tests='91' failures='0' errors='0' skipped='0' inconc='0' time='MASKED'>
   <testcase classname='BSC_Tests' name='TC_ctrl_msc_connection_status' time='MASKED'/>
   <testcase classname='BSC_Tests' name='TC_ctrl_msc0_connection_status' time='MASKED'/>
   <testcase classname='BSC_Tests' name='TC_ctrl' time='MASKED'/>
@@ -69,6 +69,8 @@
   <testcase classname='BSC_Tests' name='TC_err_82_short_msg' time='MASKED'/>
   <testcase classname='BSC_Tests' name='TC_err_84_unknown_msg' time='MASKED'/>
   <testcase classname='BSC_Tests' name='TC_ho_int' time='MASKED'/>
+  <testcase classname='BSC_Tests' name='TC_ho_out_of_this_bsc' time='MASKED'/>
+  <testcase classname='BSC_Tests' name='TC_ho_into_this_bsc' time='MASKED'/>
   <testcase classname='BSC_Tests' name='TC_bssap_rlsd_does_not_cause_bssmap_reset' time='MASKED'/>
   <testcase classname='BSC_Tests' name='TC_bssmap_clear_does_not_cause_bssmap_reset' time='MASKED'/>
   <testcase classname='BSC_Tests' name='TC_ms_rel_ind_does_not_cause_bssmap_reset' time='MASKED'/>