- Eliminate the global "boottime" variable, which was being accessed
without any synchronization against changes by e.g. clock_settime().
- Replace with new getbinboottime() / getnanoboottime() / g

- Eliminate the global "boottime" variable, which was being accessed
without any synchronization against changes by e.g. clock_settime().
- Replace with new getbinboottime() / getnanoboottime() / getmicroboottime()
functions (naming mirrors that of other time access functions in kern_tc.c).
It returns the (maybe-converted) value of timebasebin, which also tracks
our estimate of when the system was booted (i.e. the legacy "boottime" was
redundant).

XXX There needs to be a lockless synchronization mechanism for reading
timebasebin, but this is a problem in kern_tc.c that pre-existed these
"boottime" changes. At least now the problem is centralized in one location.

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More cleanup of #includes

Update to FreeBSD revision 308975 ( approx 2016-11-18 07:30 UTC)

If I'm going to try to get this working, I should at least start with
the most recent code available.

Import FreeBSD's "newnfs" nfs client and server code. This contains
nfsv4 as well as new implementations of nfsv3 and nfsv2.

This import is from tonight's FreeBSD head and is unchanged from there
ex

Import FreeBSD's "newnfs" nfs client and server code. This contains
nfsv4 as well as new implementations of nfsv3 and nfsv2.

This import is from tonight's FreeBSD head and is unchanged from there
except for automated munging of rcsids, rearranging of paths, and an
autogenerated files.* file that might or might not be syntactically
valid. (I will check in the script that does this shortly.)

There is not the slightest chance this will configure yet, let alone
compile or run.

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