sysctl: lower the syncer(4) timeouts for data flushes
sysctl: lower the syncer(4) timeouts for data flushes

o Retain the timeout priorities while cutting the timeouts to
  10% of what they were before (30s).
o Metadata is always flused by default, but change timeout to
  match the others anyway.
o Reorder the sysctl list for convenience white at it.

opnsense/core,opnsense/core,opnsense/core,opnsense/core,opnsense/core,opnsense/core