initial working osmo-smlc implementation

The lower level Lb/SCCP interface conn handling is essentially a copy of
OsmoMSC's A/SCCP infrastructure (OsmoMSC also connects to multiple BSCs).

The smlc_subscr is mostly a copy of OsmoBSC's bsc_subscr.

smlc_loc_req FSM is the SMLC side of OsmoBSC's new lcs_loc_req FSM.

cell_locations configures geographic coordinates of individual cells.

Change-Id: I917ba8fc51a1f1150be77ae01e12a7b16a853052
diff --git a/configure.ac b/configure.ac
index e9c4ffc..186721b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -212,6 +212,7 @@
     src/osmo-smlc/Makefile
     tests/Makefile
     tests/atlocal
+    tests/smlc_subscr/Makefile
     doc/Makefile
     doc/examples/Makefile
     doc/manuals/Makefile