openssh: add After dependencies on nss-user-lookup.target

Quoting 'man systemd.special':

  nss-user-lookup.target

    A target that should be used as synchronization point for all
    regular UNIX user/group name service lookups. [...] All services
    for which the availability of the full user/group database is
    essential should be ordered after this target, but not pull it
    in. All services which provide parts of the user/group database
    should be ordered before this target, and pull it in.

When no service providing parts of the user/group database exists and
thus pulls in the nss-user-lookup.target, this added dependency is a
no-op.

However, when such a service does exist, and e.g. modifies /etc/shadow
to change password or enable/disable certain accounts, it is essential
that no ssh connections are accepted until those changes are made.

(From OE-Core rev: 365b5490f3b12772ed57a6bcfd1e0e8a91185afc)

Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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