- 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

Add an missing argument to open(2). If O_CREAT flag is specified,
file permission has to be specified as well.

In usr.sbin/uhsoctl/uhsoctl.c, fix a few warnings about format strings
not being literals.

MFC after: 1 week

- Fixed automatic detection of the control serial port.
- Fixed segmentation fault when an invalid network interface was given.
- More helpful message in case of wrong PIN number.

Submitted by: Fredrik Lindberg

Add a driver by Fredrik Lindberg for Option HSDPA USB devices. These differ
from standard 3G wireless units by supplying a raw IP/IPv6 endpoint rather than
using PPP over serial. uhsoctl(1) is used to initiate and close the WAN
connection.

Obtained from: Fredrik Lindberg <fli@shapeshifter.se>