CORD-1568: Update to latest version of plyxproto to enable policy
sharing

Change-Id: I35136001aafd3d224604d4d6edbedf483b7b6e42
diff --git a/containers/xos/pip_requirements.txt b/containers/xos/pip_requirements.txt
index f2f0fd3..74efe0f 100644
--- a/containers/xos/pip_requirements.txt
+++ b/containers/xos/pip_requirements.txt
@@ -168,4 +168,4 @@
 zope.interface==4.3.3
 redis==2.10.5
 astunparse==1.5.0
-plyxproto==2.1.0
+plyxproto==2.2.0