Entity type to use as filter
NOTE: Entities are listed with their numerical mappings
in the documentation titled 'Event Messages for Wellfleet
Routers'
NOTE2: If entity type is WILDCARD(255) then the attributes
wfSyslogEntFltrLogEvtLowBnd and wfSyslogEntFltrLogEvtUppBnd will
be ignored and wfSyslogEntFltrSevMask will be used.