[SA-14:25] Fix kernel stack disclosure in setlogin(2) / getlogin(2).
[SA-14:26] Fix remote command execution in ftp(1).

Approved by: re (gjb)

Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Move determination of socket buffer sizes from startup to the first time a
socket is used. The previous code structure assumed that AF_INET sockets
were always available, which is an invalid assumption on IPv6-only systems.

This merges the fololowing revisions from NetBSD:
src/usr.bin/ftp/main.c 1.120
src/usr.bin/ftp/util.c 1.156

PR: bin/162661
Tested by: bz
Obtained from: NetBSD
MFC after: 1 week

Merge tnftp-20100108 from the vendor branch into head.

PR: bin/112288 bin/120256 bin/129014 bin/145528
MFC after: 1 month

Copy lukemftp to its new home, tnftp. I'm doing this in stages so as to
not confuse the CVS exporter.

Merge fix from r1.108 of NetBSD's usr.bin/ftp/main.c:

Only attempt to el_parse() a command unknown by the default parser
if editing is enabled.

PR: bin/100089
MFC after: 3 days

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