If chrony is used, warn that Kudu does not support it

[myloginid]

git diff -

diff --git a/lib/checks.sh b/lib/checks.sh
index e73e9fc..0b4e7d3 100644
--- a/lib/checks.sh
+++ b/lib/checks.sh
@@ -186,6 +186,10 @@ function check_os() (
                 _check_service_is_not_running 'System' 'chronyd'
             else
                 _check_service_is_running 'System' 'chronyd'
+                get_service_state 'chronyd'
+                if [ "${SERVICE_STATE['running']}" = true ]; then
+                    state "System: kudu supports only ntpd. If kudu is not used, this warning can be ignored." 2
+                fi
             fi
         else
             _check_service_is_running 'System' 'ntpd'

Tested on local -

Redirecting to /bin/systemctl status  chronyd.service
● chronyd.service - NTP client/server
   Loaded: loaded (/usr/lib/systemd/system/chronyd.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2018-10-24 06:13:55 PDT; 8min ago
     Docs: man:chronyd(8)

 PASS  System: chronyd is running
 PASS  System: chronyd auto-starts on boot
 WARN  System: kudu supports only ntpd. If kudu is not used, this warning can be ignored.
 PASS  System: Only 64bit packages should be installed

[myloginid]

Created PR #110