Don't treat non-zero ntp exit code as an error.

dhwthompson · dhwthompson · commit 94e5b8fb56f7 · 2013-08-28T11:11:13.000+01:00
`ntp` returns with a non-zero code when the NTP clock has drifted too
far; that's not an error from the point of view of the Fabric command.
diff --git a/ntp.py b/ntp.py
@@ -3,7 +3,7 @@
 @task
 def status():
     """Report the VM's NTP status."""
-    run("/usr/lib/nagios/plugins/check_ntp_time -q -H ntp.ubuntu.com -w 2 -c 3")
+    run("/usr/lib/nagios/plugins/check_ntp_time -q -H ntp.ubuntu.com -w 2 -c 3", warn_only=True)
 
 @task
 def resync():
