Wait for mgr to be functional before accessing it

PROD-34796

Change-Id: I6e754c19abc3eb738be29eea6eec2d03457a4532
diff --git a/tests/test-requirements.txt b/tests/test-requirements.txt
new file mode 100644
index 0000000..bc7dc7f
--- /dev/null
+++ b/tests/test-requirements.txt
@@ -0,0 +1,4 @@
+jsonschema
+reno
+setuptools<45.0.0
+msgpack<1.0.0