Monitor only pillar-defined interfaces.

Fixes PROD-34929

Change-Id: I087102f8017af927d853da65a33d0a0e8a092f67
diff --git a/tests/test-requirements.txt b/tests/test-requirements.txt
index 0480052..bc7dc7f 100644
--- a/tests/test-requirements.txt
+++ b/tests/test-requirements.txt
@@ -1,3 +1,4 @@
 jsonschema
 reno
-setuptools<45.0.0
\ No newline at end of file
+setuptools<45.0.0
+msgpack<1.0.0