handle iburst option

tests/test_ntp.py

@@ -21,7 +21,7 @@ if os.path.isfile('/usr/bin/ntpq'):
     cmd = 'LANG=C ntpq -pd'
     expected = 'remote'
     ntpconf = '/etc/ntp.conf'
-    ntpconf_expected = r'^(?:server|pool)\s(.*)$'
+    ntpconf_expected = r'^(?:server|pool)\s([a-zA-Z0-9\._-]+)(?:\s*iburst)?$'
 else:
     cmd = 'LANG=C timedatectl'
     expected = 'NTP synchronized'
@@ -52,7 +52,7 @@ if not expected_servers:
     if 'Ubuntu' in subprocess.getoutput('lsb_release -a'):
         expected_servers = ['ntp.ubuntu.com']
     else:
-        expected_servers = ['0.debian.pool.ntp.org iburst']
+        expected_servers = ['0.debian.pool.ntp.org']
 
 with open(ntpconf, 'r') as f:
     content = f.read()