In krb5_sname_to_principal(), we always do a forward canonicalization
using getaddrinfo() with AI_CANONNAME set. Then, we do a reverse
canonicalization with getnameinfo() if rdns isn't set to false in
Current glibc (tested with eglibc 2.11.1) has the arguably buggy
behavior of doing PTR lookups in getaddrinfo() to get the canonical
name, if hints.ai_family is set to something other than AF_UNSPEC.
This behavior defeats the ability to turn off rdns. Work around this
behavior by using AF_UNSPEC in krb5_sname_to_principal() from the
start, instead of starting with AF_INET and falling back. Specify
AI_ADDRCONFIG to avoid AAAA lookups on hosts with no IPv6 addresses.
Commit By: ghudson