large change:

large change:

*)  consolidates the dc location routines again (dns
    and netbios)  get_dc_list() or get_sorted_dc_list()
    is the authoritative means of locating DC's again.

    (also inludes a flag to get_dc_list() to define
     if this should be a DNS only lookup or not)

    (however, if you set "name resolve order = hosts wins"
     you could still get DNS queries for domain name IFF
     ldap_domain2hostlist() fails.  The answer?  Fix your DNS
     setup)

*)  enabled DOMAIN<0x1c> lookups to be funneled through
    resolve_hosts resulting in a call to ldap_domain2hostlist()
    if lp_security() == SEC_ADS

*)  enables name cache for winbind ADS backend

*)  enable the negative connection cache for winbind
    ADS backend

*)  removes some old dead code

*)  consolidates some duplicate code

*)  moves the internal_name_resolve() to use an IP/port pair
    to deal with SRV RR dns replies.  The namecache code
    also supports the IP:port syntax now as well.

*)  removes 'ads server' and moves the functionality back
    into 'password server' (which can support "hostname:port"
    syntax now but works fine with defaults depending on
    the value of lp_security())
(This used to be commit d7f7fcda425bef380441509734eca33da943c091)