Log Message:
net/coturn: Set up partitioned data directory with right permissions

(This is step 3 of the 3-way merge from wip, and I think the end.)

Because the daemon runs as a non-root user, it needs to have the state
directory pre-created with the right uid/gid and (probably) also
permissions to prevent randoms from reading the state.

PKGREVISION set to high enough that this will seem newer than the wip packages.