add osmo-auc-gen_test

Add test for osmo-auc-gen invocations to ensure stability across upcoming SQN
increment scheme changes.

The test comprises of a shell script that invokes the osmo-auc-gen binary with
various milenage parameters, of which the stdout/stderr are verified.

More osmo-auc-gen invocations could be added, but my main focus is on the SEQ
changes. Instead of manually testing that it still works for each SQN patch, I
want this test to do it for me.

To make sure that osmo-auc-gen is build before the tests are launched, place
'utils' before 'tests' in the root Makefile.am.

Related: OS#1968
Change-Id: Ib4af34201cd2e7d76037bcd31dd89ef18c1a9aec
diff --git a/Makefile.am b/Makefile.am
index 1d17da5..e5639d3 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -1,7 +1,7 @@
 ACLOCAL_AMFLAGS = -I m4
 
 AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
-SUBDIRS = include src src/vty src/codec src/gsm src/coding src/gb src/ctrl src/sim tests utils
+SUBDIRS = include src src/vty src/codec src/gsm src/coding src/gb src/ctrl src/sim utils tests
 
 pkgconfigdir = $(libdir)/pkgconfig
 pkgconfig_DATA = libosmocore.pc libosmocodec.pc libosmovty.pc libosmogsm.pc \