Cherry-pick 8905: Change to sane default timeout

Change-Id: I3bcdbf727e4b69deeb15fff83deb6598506f58f7
Signed-off-by: David Garcia <david.garcia@canonical.com>
diff --git a/test-requirements.txt b/test-requirements.txt
index 6cafdc8..45ed6dc 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -16,3 +16,4 @@
 mock
 requests-mock
 coverage==4.5.3
+asynctest