Update xvm-munin-config to version 0.0.16

Requested by iannucci/root@ATHENA.MIT.EDU

diff --git a/xvm-munin-config b/xvm-munin-config
index ebc108e..3a0177b 160000 (submodule)
--- a/xvm-munin-config
+++ b/xvm-munin-config
@@ -1 +1 @@
-Subproject commit ebc108e40cb5185084d13762bebe3894554a3cc5
+Subproject commit 3a0177be29e10ed17cb283ff856173f5c7532868