stats/vty: Add stats_vty.c

This file will contain the VTY code related to statistics.

This commit adds a minimal file with just as single VTY command:

- show stats    This command shows all statistical values

To enable this and future commands, the main program needs to call
stats_vty_add_cmds().

Sponsored-by: On-Waves ehf
diff --git a/src/vty/Makefile.am b/src/vty/Makefile.am
index 4225d27..7c549d9 100644
--- a/src/vty/Makefile.am
+++ b/src/vty/Makefile.am
@@ -9,7 +9,7 @@
 lib_LTLIBRARIES = libosmovty.la
 
 libosmovty_la_SOURCES = buffer.c command.c vty.c vector.c utils.c \
-			telnet_interface.c logging_vty.c
+			telnet_interface.c logging_vty.c stats_vty.c
 libosmovty_la_LDFLAGS = -version-info $(LIBVERSION) -no-undefined
 libosmovty_la_LIBADD = $(top_builddir)/src/libosmocore.la
 endif