This ensures that 'urandom-seed' is started before programs that rely on sources of randomness. Fixes <https://bugs.gnu.org/29773>. Reported by Leo Famulari <leo@famulari.name>. * gnu/services/base.scm (urandom-seed-shepherd-service): Change 'requirement' to (file-systems). (urandom-seed-service-type): Extend USER-PROCESSES-SERVICE-TYPE.