Adjust the handling of pending log events during boot: - Fetch events from the controller in batches of 15 rather than a single   event at a time. - When fetching events from the controller, honor the event class and   locale settings (via hw.mfi tunables).  This also allows the firmware to   skip over unwanted log entries resulting in fewer requests to the   controller if there many unwanted log entries since the last clean   shutdown. - Don't drop the driver mutex while decoding an event. - If we get an error other than MFI_STAT_NOT_FOUND (basically EOF for   hitting the end of the event log) then emit a warning and bail on   processing further log entries.
Adjust the handling of pending log events during boot:
- Fetch events from the controller in batches of 15 rather than a single
  event at a time.
- When fetching events from the controller, honor the event class and
  locale settings (via hw.mfi tunables).  This also allows the firmware to
  skip over unwanted log entries resulting in fewer requests to the
  controller if there many unwanted log entries since the last clean
  shutdown.
- Don't drop the driver mutex while decoding an event.
- If we get an error other than MFI_STAT_NOT_FOUND (basically EOF for
  hitting the end of the event log) then emit a warning and bail on
  processing further log entries.

Reviewed by:	ambrisko, scottl
MFC after:	2 weeks

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase