oap: add oap testsuite skeleton

Sponsored-by: On-Waves ehf
diff --git a/openbsc/.gitignore b/openbsc/.gitignore
index 2210c47..ca73db6 100644
--- a/openbsc/.gitignore
+++ b/openbsc/.gitignore
@@ -77,6 +77,7 @@
 tests/mgcp/mgcp_transcoding_test
 tests/sgsn/sgsn_test
 tests/subscr/subscr_test
+tests/oap/oap_test
 
 tests/atconfig
 tests/atlocal