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ntp: restrict to localhost

root@sloth:~# netstat -tulpen|grep ntp
udp        0      0 176.53.69.122:123       0.0.0.0:*                           0          4960        1827/ntpd       
udp        0      0 127.0.0.1:123           0.0.0.0:*                           0          4958        1827/ntpd       
udp        0      0 0.0.0.0:123             0.0.0.0:*                           0          4951        1827/ntpd       
udp6       0      0 fe80::216:36ff:fe1a:123 :::*                                106        5553        1827/ntpd       
udp6       0      0 ::1:123                 :::*                                0          4961        1827/ntpd       
udp6       0      0 :::123                  :::*                                0          4952        1827/ntpd

(from redmine: created on 2012-12-16, closed on 2013-10-08)