proxies: drop ipv6 restart script
    
    Yesterdays fix: a script that restarted networking to bring back a ipv6
    route on proxy11, causes:
    Todays bug: restarting the interface every minute causes the nameserver
    to burp and not find sundries01, so all the rsyncs fail. It seems to
    handle this just fine now, so lets retire this glorious hack.
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>