MFC r262645,r262647:
ssh-copy-id: avoid sending private keys; add -v option

To help avoid confusion: when attempting to send a key file check to see if a
	file of the same name exists with a '.pub' suffix and send that instead.  This
	mimics the behavior of other ssh-copy-id scripts.

	Add -v passthrough.

ssh-copy-id: add restorecon call

	In certain situations when creating an authorized_key file on a Linux machine
	restorecon(1) may need to be called.  Therefore, attempt to run it if it exists.