info: : slow ssh authentication, pings slow/timeout when using fqdn

issue: SSH just sits here for a while when trying to connect.

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strace ssh myhostname ...
write(5, "RESOLVE-ADDRESS 192.168.1.1n", 27) = 27
...

Reason: mdns listed in nsswitch.conf doesn’t allow reverse dns to return failure immeditately when DNS lookup return NXDOMAIN.

Resolution: modify /etc/nsswitch.conf

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- hosts:          files mdns4_minimal [NOTFOUND=return] dns mdns4
  hosts: files mdns4_minimal [NOTFOUND=return] dns [NOTFOUND=return] mdns4