Use SysUtil::sleepu() rather than usleep().
Use SysUtil::sleepu() rather than usleep().

Did not add any read accessor calls to SignedMulticast, as there is no
reference to any state variable.  Delay is read, but constructor parameters
are constant member variables so the snapshot is not needed for these.

jojochuang/eventwave,jojochuang/eventwave,jojochuang/eventwave,jojochuang/eventwave,jojochuang/eventwave