netstat output issues

[Rich Felker]

Two small issues I found in busybox's netstat vs non-busybox versions:

1. The "any" address 0.0.0.0 or :: is not printed as '*' but actually
   looked up via the resolver. If nothing else this is a waste of
   time; it's also (at least in my opinion) uglier and harder to read.

2. IPv6 literals are printed without brackets around them, resulting
   in confusion between the port number and the ':' characters within
   the address.

Neither is a big deal, but these might be nice to fix at some point if
others agree.

Rich