- 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

Fix resource leaks

Found by: Coverity Scan, CID 1016673, 1007118
Approved by: re

Add firmware downloading support for Samsung drives

Tested on Samsung SM1625 SSDs.

Improve firmware download status check. Previous check was insufficient for
ATA since it ignored transport errors like command timeouts, while for SCSI
it was just wrong.

More -Wmissing-variable-declarations fixes.

In addition to adding `static' where possible:

- bin/date: Move `retval' into extern.h to make it visible to date.c.
- bin/ed: Move globally used variables into ed.h.
- sbin/camcontrol: Move `verbose' into camcontrol.h and fix shadow warnings.
- usr.bin/calendar: Remove unneeded variables.
- usr.bin/chat: Make `line' local instead of global.
- usr.bin/elfdump: Comment out unneeded function.
- usr.bin/rlogin: Use _Noreturn instead of __dead2.
- usr.bin/tset: Pull `Ospeed' into extern.h.
- usr.sbin/mfiutil: Put global variables in mfiutil.h.
- usr.sbin/pkg: Remove unused `os_corres'.
- usr.sbin/quotaon, usr.sbin/repquota: Remove unused `qfname'.

Update the 'fwdownload' command to also flash disks connected over an
ATA/SATA transport. The detection logic is automatic, so it should Just
Work. While here, also improve the progress meter that is displayed
during firmware download.

Submitted by: Alistair Crooks
Obtained from: Netflix, Inc.
MFC after: 3 days

Add missing static keywords to global variables in camcontrol.

While there, make the vendor list const and add appropriate keywords to
functions that use this list.

Restore comment with credit to Marc Frajola.

fwdownload.c is derived from Andre Albsmeier's fwdownload.c, which was
written from scratch but was inspired by Marc's original idea and code.

Add firmware update support for SCSI devices.

Firmware can be reprogrammed on devices from Hitachi, HP, IBM, Plextor,
Quantum, and Seagate. At least one device from each manufacturer has
been tested with some version of this code, and it has been used to
update thousands of drives so far.

The man page suggests having a backup of the drive's data, and the
operation must be confirmed, either interactively or on the command
line. (This is the same as the confirmation on the format command.)

This work is largely derived from fwprog.c by Andre Albsmeier.

Submitted by: Nima Misaghian
Sponsored by: Sandvine Incorporated
MFC after: 3 months