The UTIDServer device provides Universal Unique Timing Identifiers (UTID)s
to a distributed Karabo installation, by emitting signalTimeTicks.
In the EuXFEL context a UTID corresponds to a train id.
In this basic implementation the POSIX timestamp is used to deduce the
UTID on the precision of period.
The device can be subclassed to implement more sophisticated timing
provision, e.g. on-top of a protocol like White Rabbit. In this case
the get_utid needs to be overwritten.