Setting tmnxChassisModeForce to a value of 'doAction' in the
same SNMP SET request where tmnxChassisAdminMode is set to a greater
mode than the current mode (ie. New mode 'modeB', while current is
'modeA') allows the chassis to be upgraded to to the new mode even if
there are IOM cards in the chassis with a tmnxCardAssignedType value
that does not support the new mode.
An attempt to set tmnxChassisModeForce to 'doAction' without
also setting tmnxChassisAdminMode, in the same SNMP SET request
will fail with an inconsistentValue error.