- 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 examples to the ssh-copy-id script.

Approved by: bcr (mentor)
MFC after: 3 days

Clarify where the authorized_key file lives.

Approved by: bcr (mentor)
MFC after: 3 days

Add the standard exit status to the ssh-copy-id man page.

Approved by: bcr (mentor)
MFC after: 3 days

Be a bit more paranoid.
Use more portable constructs in order to allow upstream adoption
Add per-file error messages

Reviewed by: jilles
Approved by: cperciva
MFC after: 1 week

Somehow this got replicated too many times

Approved by: cperciva (implicit)

Add a clean-room reimplementation of a script originally
found in openssh's contrib directory.

This version has more features and is better written.
I intend to submit this upstream as well.

Reviewed by: bapt
Reviewed by: des
Approved by: cperciva
MFC after: 1 week