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systemd-homed: various fixups #839

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Commit messages for each commit should explain more, let me know if you have any more questions.

Thanks!

systemd-homed provides a varlink API with a unix socket at
/run/systemd/userdb/io.systemd.Home to query user account records. As
quite a few things will need to be able to query this API for basic
functionality to work - such as `groups(1)` being able to operate on
systemd-homed user accounts - let's make an interface for this.

Signed-off-by: Rahul Sandhu <[email protected]>
systemd-homed user records rely on being able to talk to the dbus and
varlink APIs provided to obtain basic account information such as user
id, name, group membership, etc as they do not have /etc/passwd,
/etc/group or /etc/shadow fields. For tty login to work for homed user
accounts, local_login_t needs to be able to lookup this information, so
let's grant it the ability to.

Signed-off-by: Rahul Sandhu <[email protected]>
systemd-homed user records stored in identity files are machine-id
specific and signed, so systemd-homed needs access to /etc/machine-id to
create those records properly.

Signed-off-by: Rahul Sandhu <[email protected]>
systemd-homed stores LUKS home images as `/home/username.home`, so let's
label that appropriately.

Signed-off-by: Rahul Sandhu <[email protected]>
For commands such as `groups(1)` to work, nsswitch_domain needs to be
able to talk to /run/systemd/userdb/io.systemd.Home to obtain
information on systemd-homed users.

Signed-off-by: Rahul Sandhu <[email protected]>
As systemd-homed's workdir is an internal one, and external domains may
be (reasonably) expected to connect to systemd_homed_runtime_t in the
future, let's create a new domain for systemd-homed's internal work to
differentiate between the two.

Signed-off-by: Rahul Sandhu <[email protected]>
systemd-homed needs access to `/run/cryptsetup` to properly setup and
unlock LUKS encrypted home directories.

Signed-off-by: Rahul Sandhu <[email protected]>
As systemd identity files contain sensitive data, such as password
hashes, let's create a new type systemd_homed_record_t for them. As
systemd_homework_t needs to be able to read, create, and delete these
files, let's give it permissions to do so.

Signed-off-by: Rahul Sandhu <[email protected]>
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