FreeNAS Code

Update istgt to 20110902 which provides compatibility with ESXi 5.0

Commit forgotten files for avahi fix.

Backport two netatalk revisions that fixes crashes if avahi is not started.

Backport revisions from FreeBSD:

r224531 (mav)

Higher-priority initialization request can eat request scheduling done from
adaclose(). Add immediate_priority check into adaschedule() to restore it.

r224283 (mav)

Do not try to execute FLUSHCACHE on close and print extra messages for
invalidated (considered lost) ada device. Exactly same already done for
the da devices.

Add my patches backported from netatalk repository.

Revert r7345 until I can figure out how to get the
chroot stuff in the nanobsd build infrastructure to
pick up /usr/src properly.

Remove the custom graid5 patch in favor of the
sysutils/graid5 port. Untested because my build
didn't produce an image (weird).

This addresses bug # 606.

- Don't force istgt to start before mountcritremote;
- Start ix-istgt after mountlate.

Raise default blocksize and fragment size to 32K and 4K.

Quote from Kirk McKusick:

Raise the default blocksize for UFS/FFS filesystems from
16K to 32K and the default fragment size from 2K to 4K.

The rational is that most disks are now running with 4K
sectors. While they can (slowly) simulate 512-byte sectors
by doing a read-modify-write, it is desirable to avoid this
functionality. By raising the minimum filesystem allocation
to 4K, the filesystem will never trigger the small sector
emulation.

Also, the growth of disk sizes has lead us to double the
default block size about every ten years. The rise from 8K
to 16K blocks was done in 2001. So, by the 10-year metric,
the time has come for 32K blocks.

Discussed at: May 2011 BSDCan Developer Summit
Reference: http://wiki.freebsd.org/201105DevSummit/FileSystems

update istgt port plus the ability to use aio