Don't change the state of the system in acpi_tz_establish(). Before, we

would turn off all fans when initializing a zone.  However, the HP Omnibook
500 generates a notify saying the zone needs to be re-evaluated whenever
its fan is switched on or off.  This produced an infinite loop.  Also, note
that running _SCP can generate the same notify.

Since we need to make sure old fan references are turned off when getting
new ones, run acpi_tz_monitor() first.  This will turn off any unneeded
fans.  Then, check for new settings.  After that, run acpi_tz_monitor()
again to turn on/off any fans referenced by the new settings.

Tested by:	brooks

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