main: add VTY and '-c config-file' option

Add config file, mainly for logging control.

Open VTY on the OMSO_VTY_PORT_HLR added to libosmocore in
commit 92fa18e6b800a27aa064a5fb8321cddd7383ae20
aka change-id I08cb52d9399a27e6876e45da36f434708c4fddef.

Add hlr_vty.h/c for standard VTY setup.
Add -c option to pass config file.
Add --version option.

Change-Id: Iedb884345a597371a337b0c67eb6013b7d5d1ce1
diff --git a/src/Makefile.am b/src/Makefile.am
index 6c6c9e6..9bbc13e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -18,6 +18,7 @@
 	gsup_server.h \
 	logging.h \
 	rand.h \
+	hlr_vty.h \
 	$(NULL)
 
 bin_PROGRAMS = \
@@ -38,6 +39,7 @@
 	hlr.c \
 	logging.c \
 	rand_urandom.c \
+	hlr_vty.c \
 	$(NULL)
 
 osmo_hlr_LDADD = \