accounts: Add /etc/subuid and /etc/subgid support.

This commit adds a new record type, <subid-entry> and serializers
and deserializers for it in (gnu build accounts).  Each instance of this
record represents one line in either /etc/subuid or /etc/subgid.  Since
Shadow uses the same representation for both files, it should be ok if
we do it as well.

This commit adds also <subid-range>, a user facing representation of
<subid-entry>. It is supposed to be usable directly in OS configurations.

* gnu/build/accounts.scm (subid-entry): New record;
(write-subgid): add serializer for subgids;
(write-subuid): add serializer for subuids;
(read-subgid): add serializer for subgids;
(read-subuid): add serializer for subuids.
* gnu/system/accounts.scm (subid-range): New record.
* test/accounts.scm: Test them.

Change-Id: I6b037e40e354c069bf556412bb5b626bd3ea1b2c
Signed-off-by: Giacomo Leidi <goodoldpaul@autistici.org>
Signed-off-by: Ludovic Courtès <ludo@gnu.org>

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