oap_test.c: rename to avoid clash with libosmocore oap_test.c

Rename to oap_client_test.c, which is also a more accurate name.

Related: OS#1592
Change-Id: I3ca333141a15940df07a1ae77a30bc54885db41f
diff --git a/openbsc/tests/testsuite.at b/openbsc/tests/testsuite.at
index b44d595..0765c76 100644
--- a/openbsc/tests/testsuite.at
+++ b/openbsc/tests/testsuite.at
@@ -107,8 +107,8 @@
 AT_SETUP([oap])
 AT_KEYWORDS([oap])
 AT_CHECK([test "$enable_oap_test" != no || exit 77])
-cat $abs_srcdir/oap/oap_test.ok > expout
-AT_CHECK([$abs_top_builddir/tests/oap/oap_test], [], [expout], [ignore])
+cat $abs_srcdir/oap/oap_client_test.ok > expout
+AT_CHECK([$abs_top_builddir/tests/oap/oap_client_test], [], [expout], [ignore])
 AT_CLEANUP
 
 AT_SETUP([gtphub])