Disabled IPv6, but IPv6 sockets still shows up in netstat.

Issue

• Disabled ipv6, however ipv6 sockets still shows up in netstat.

# netstat -neopa | grep tcp6
tcp6       0      0 :::111                  :::*                    LISTEN      0          18794      1820/rpcbind
tcp6       0      0 :::20048                :::*                    LISTEN      0          60503690   20946/rpc.mountd
tcp6       0      0 :::49072                :::*                    LISTEN      29         20268      1818/rpc.statd
tcp6       0      0 :::45297                :::*                    LISTEN      0          16984      -
tcp6       0      0 :::44053                :::*                    LISTEN      0          20307      -
tcp6       0      0 :::22                   :::*                    LISTEN      0          16188      1110/sshd
tcp6       0      0 :::24346                :::*                    LISTEN      0          17508      1109/xinetd
tcp6       0      0 :::2049                 :::*                    LISTEN      0          60503752   -