- Copy stable/10 (r259064) to releng/10.0 as part of the
10.0-RELEASE cycle.
- Update __FreeBSD_version [1]
- Set branch name to -RC1

[1] 10.0-CURRENT __FreeBSD_version value ended at '55', so
start releng/10.0 at '100' so the branch is started with
a value ending in zero.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Let umount build with -Wold-style-definition.

Make umount(8) WARNS=6 clean:
- Cast delimiter width to integer [1]
- Solve name conflicts against system header
- Constify parameters to avoid qualifier conflict

PR: bin/140017 [1]
Submitted by: Ulrich Spörlein <uqs spoerlein net> [1]
MFC after: 1 month
Sponsored by: iXsystems, Inc

Don't use sys/nfs/rpcv2.h - it is part of the old kernel RPC implementation
and will be removed.

Use __FBSDID over rcsid[]. Protect copyright[] where needed.

Fix a few bugs, some of which I introduced in recent commits:
- clean_mtab():
Actually use the strdup'd version of the host that we go to the
trouble of creating.
- do_umntall/do_umount:
Don't return success if clnt_create() fails.
Don't access a client pointer after it has been destroyed.
Remember to destroy the authentication information we created.

Fix some bugs and general brain damage in mounttab:
- Declare mtabhead as an extern in mounttab.h and define it only in
mounttab.c.
- Remove shared global `verbose' and instead pass it as a parameter.
- Remove the `mtabp' argument to read_mtab(). It served no purpose
whatsoever, although read_mtab() did use it as a temporary local
variable.
- Don't check for impossible conditions when parsing mounttab, and
do detect zero-length fields.
- Correctly test for strtoul() failures - just testing ERANGE is wrong.
- Include a field name in syslog errors, and avoid passing NULL to
a syslog %s field.
- Don't test if arrays are NULL.
- If there are duplicates when writing out mounttab, keep the last
entry instead of the first, as it will have a later timestamp.
- Fix a few formatting issues.

Update rpc.umntall and umount to match the mounttab interface changes.

Fixed printf format errors which corrupted /var/db/mounttab on i386's with
64-bit longs (don't assume that time_t is long; assume that time_t's are
representable as longs).

This is another in Martin Blapp's N-series of mount-related cleanups :)
Changes are:
- rpc.umntall is called at the right places now in /etc/rc*
- rpc.umntall timeout has been lowered from two days (too high) to one
- verbose messages in rpc.umntall have been clarified
- kill double entries in /var/db/mounttab when rpc.umntall is invoked
- ${early_nfs_mounts} has been removed from /etc/rc
- patched mount(8) -p to print different pass/dump values for ufs filesystems.
(last patch recieved from dan <bugg@bugg.strangled.net>)

Submitted by: Martin Blapp <mbr@imp.ch>, dan <bugg@bugg.strangled.net>

Add rpc.umntall utility, to be used by startup and shutdown scripts
to replace (broken) umntall signal code previously in mountd.

Submitted by: Martin Blapp <mb@imp.ch>