Add CSIT tests for AAF Cert Service

Issue-ID: AAF-995
Signed-off-by: Aleksandra Maciaga <aleksandra.maciaga@nokia.com>
Change-Id: Iaf96cfb08ba9f83b1ebb5f382a530fcec9333a84
diff --git a/tests/aaf/certservice/assets/invalid.key b/tests/aaf/certservice/assets/invalid.key
new file mode 100644
index 0000000..6484fb6
--- /dev/null
+++ b/tests/aaf/certservice/assets/invalid.key
@@ -0,0 +1 @@
+bbbb
\ No newline at end of file