Per-module control for reverting a primary module back from its active
redundant spare module:
off - Disable reverting to the primary module.
immediate - Revert as soon as this primary module is ready to
enter the online state.
timeAndDate - Revert to this primary module at time specified by
juniSystemModuleRedundancyRevertTime, provided it is
in the inactive state.
This control only applies to primary modules; spare modules can only be
set to off(0).