- 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 regression tests for ethers(3) functions, including new _r variants.
Four tests currently fail:

test_ether_line_bad_1() and test_ether_line_bad_2() due to bugs in
ether_line(3).

test_ether_ntohost() and test_ether_hostton() due to not being fully
implemented tests.