Use the appropriate IPv6 hashtype defines when looking up the PCBGROUP

Reviewed by:	adrian@
Use common vt_fb parts in ofwfb as far as we are able without sacrificing
performance.

MFC after:	2 weeks
Remove ia64.

This includes:
o   All directories named *ia64*
o   All files named *ia64*
o   All ia64-specific code guarded by __ia64__
o   All ia64-specific makefile logic
o   Mention of ia64 in comments and documentation

This excludes:
o   Everything under contrib/
o   Everything under crypto/
o   sys/xen/interface
o   sys/sys/elf_common.h

Discussed at: BSDcan
Implement ABORT TASK SET and I_T NEXUS RESET task management functions.

Use the last one to terminate active commands on iSCSI session termination.
Previous code was aborting only commands doing some data moves.
Improve support for Intel Lynx Point USB 3.0 controllers by masking
the port routing bits like done in Linux.

MFC after:	1 week
Tested by:	Tur-Wei Chan <twchan@singnet.com.sg>
When new connection comes in, check whether we already have session from
the same intiator (Name+ISID).  If so -- terminate the old session and let
the new one take its place, as required by iSCSI RFC.
Correction to r268356: collide only sessions to the same target.
Optim and Fix for mge driver:
- add missing rcvif in mbuf
- add missing ipacket stat
- remove uncessary mbuf copy on output path
- fix deadlock of the TX engine in case of error

Obtained from:	NETASQ
MFC after:	2 weeks
Fix bugs for PERSISTENT RESERVE OUT bits in r268096.
Teach ctl_add_initiator() to dynamically allocate IIDs from pool.

If port passed negative IID value, the function will try to allocate IID
from the pool of unused, based on passed wwpn or name arguments.  It does
all its best to make IID unique and persistent across reconnects.

This makes persistent reservation properly work for iSCSI.  Previously,
in case of reconnects, reservation could be unexpectedly lost, or even
migrate between intiators.
Add support for READ FULL STATUS action of PERSISTENT RESERVE IN command.
Fix "use after free" on port creation error in r268291.
Don't call crdup nor uifind under vnode lock.

A locked vnode can get into the way of satisyfing malloc with M_WATOK.

This is a fixup to r268087.

Suggested by:	kib
MFC after:	1 week
Regenerate src.conf.5, which was completely busted by r268351.
Document C_HARDCLOCK flag.
Make XPT_GET_TRAN_SETTINGS to report CAM that command queueing is enabled,
but make couple changes to handle non-queued commands too, if happen.

MFC after:	2 weeks
Don't need this in the master branch.