sshd.socket launches the templated sshd@.service, so by moving the
sshdgenkeys.service to sshd.socket, key generation can start in advance
of a connection.
(From OE-Core rev: af38a39b4bed9e43c5075008be47ca72191a489e)
Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>