Pull up following revision(s) (requested by ozaki-r in ticket #28):
	sys/rump/net/lib/libshmif/shmifvar.h: revision 1.8
	sys/rump/net/lib/libshmif/if_shmem.c: revision 1.63
	sys/rump/net/lib/libshmif/shmifvar.h: revision 1.9
Make shmif SIMPLEX
Add a sender field to a packet header on a shmif bus to identify
and ignore packets sent by itself.
This makes shmif work with bridges.
ok pooka@
Bump SHMIF_VERSION
Pull up following revision(s) (requested by hannken in ticket #29):
	sbin/mount_ptyfs/mount_ptyfs.8: revision 1.14
	sys/fs/ptyfs/ptyfs_vnops.c: revision 1.48
	sys/fs/ptyfs/ptyfs_vnops.c: revision 1.49
	sys/fs/ptyfs/ptyfs_subr.c: revision 1.30
	sys/fs/ptyfs/ptyfs_subr.c: revision 1.31
	sys/fs/ptyfs/ptyfs_vfsops.c: revision 1.51
	sys/fs/ptyfs/ptyfs_subr.c: revision 1.32
	sys/fs/ptyfs/ptyfs_vfsops.c: revision 1.52
	sys/fs/ptyfs/ptyfs_vfsops.c: revision 1.53
	sys/fs/ptyfs/ptyfs.h: revision 1.13
	sys/fs/ptyfs/ptyfs.h: revision 1.14
Needs HASH_SLIST, not HASH_LIST.
Change ptyfs to vcache.
- Use (type, minor) as key.
- Change ptyfs_allocvp to return a referenced vnode and lock where needed.
- Remove unneeded vnode backpointer ptyfs_vnode.
- Keep a single hashlist for pty nodes to make their attributes persistent.
OK: Christos Zoulas
Overflow if *data_len == OSIZE and args->version >= PTYFS_ARGSVERSION.
Sent on tech-kern@, ok christos@
Adapt to reality -- already open BSD style nodes do not appear on
ptyfs mounts (this changed some months ago).
- Add a map of active controlling ptys per mount and no longer abuse
  the vnode lifecycle.
- No longer set "recycle" on VOP_INACTIVE().
- Make ptyfs_used_get() private to ptyfs_subr.c
- Stop copying device attributes from traditional ptys on first allocation.
- Remove unneeded argument "lwp" from ptyfs_allocvp() and ptyfs_free_get().
OK: Christos Zoulas
Tickets 29, 30