Unsynchronized TSCs on the host require special handling in bhyve:

- use clock_gettime(2) as the time base for the emulated ACPI timer instead
  of directly using rdtsc().

- don't advertise the invariant TSC capability to the guest to discourage it
  from using the TSC as its time base.

Discussed with:	jhb@ (about making 'smp_tsc' a global)
Reported by:	Dan Mack on freebsd-virtualization@
Obtained from:	NetApp
Cast to (void *)(uintptr_t) on copyout and copyin of zfs_iocparm_t.zfs_cmd

MFC after:	9 days
Fix build.
Make ctladm(8) try to load ctl.ko kernel module if needed.

Reviewed by:	ken
Remove the number of addresses restriction from sctp_connectx().
Remove unused code.
While there, do some cleanup of the code.

MFC after: 1 week
Fix a time calculation error in ctlstat_standard().

ctlstat.c:	When converting a timeval to a floating point
		number in ctlstat_standard(), cast the nanoseconds
		calculation to a long double, so we don't lose
		precision.  Without the cast, we wind up with a
		time in whole seconds only.

Sponsored by:	Spectra Logic
MFC after:	3 days