openssh: only create sshd host keys which have been enabled
Previously sshd_check_keys would create a full set of all possible
sshd host keys, even if sshd_config has been set to only enable
certain key types.
Update sshd_check_keys to only create keys which have been enabled in
sshd_config (with a fallback to creating a full set of key types if
no HostKey options are defined, as before).
Signed-off-by: Andre McCurdy <armccurdy@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
