support timedatectl for ntp test

tests/test_ntp.py

@@ -11,10 +11,17 @@ import subprocess
 import imp
 
 # Check that ntpd is synced
-print('Running ntpq -pd')
-ntpd_status = subprocess.getoutput('LANG=C ntpq -pd')
-if 'remote' not in ntpd_status:
-    print('NTP not working, ntpq -p output:\n%s' % ntpd_status)
+if os.path.isfile('/usr/bin/ntpq'):
+    cmd = "LANG=C ntpq -pd"
+    expected = "remote"
+else:
+    cmd = "LANG=C timedatectl"
+    expected = 'NTP synchronized'
+
+print("Running %s" % cmd)
+status = subprocess.getoutput(cmd)
+if expected not in status:
+    print('NTP not working: %s' % status)
     sys.exit(1)
 else:
     print('System is NTP synchronized')