Add ELsyslog class as destination option.
Add syslog destination option:

-  add new class ELsyslog that inherits from ELoutput
-  adjust ELadministrator with some C++11 semantics

-  add tools/syslog/ dir with rsyslog conf. example and sqlite3 router
Remove syslog option from mf statistics printout
Merge branch 'cdcvs/master'

Import latest changes from upstream which remove some code and
provide additional tools.
Merge commit 'f2c8aa4de0d07634ab0eb029b150e1025f8369d5'

Import upstream messagefacility changes:

- Updates to code
- New syslog feature

Update FNALCore build to take account of new files. Note that the new tests
in messagefacility, MFTest and MFTimingService will fail at present as they
require FHICL_FILE_PATH to be set. That's also a bug upstream so presumably
will be fixed onces tests are ported to cet_test or similar.