openssh: add /lib/systemd/system to server package
openssh: add /lib/systemd/system to server package

ssh.socket should be included in any of the packages to avoid QE error
ssh*.service are automatically added to FILES_${PN} by systemd.bbclass
because they are specified as SYSTEMD_SERVICE_${PN},
but add explicitly in case of omission

Signed-off-by: Toshiko YOSHIDA <311de952d79aff7d5c68e1437a41a732e1c05c82@toshiba.co.jp>

nghiaht-tsdv/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,tienlee/meta-debian,nghiaht-tsdv/meta-debian,tienlee/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,nghiaht-tsdv/meta-debian,tienlee/meta-debian,meta-debian/meta-debian,nghiaht-tsdv/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,nghiaht-tsdv/meta-debian,nghiaht-tsdv/meta-debian,tienlee/meta-debian