Since active task's destruction might result in adopting tasks from a
rekeyed ike sa it seems better to first destroy the active task list and
then destroy all queued tasks. This way adoption is possible at all,
while otherwise the queued task list would be empty.
Having the inherit() function delayed to the IKE_SA establish procedure
was problematic. The task destroy function was never a good place and
results in locking/cleanup problems. After establishing the SA, it
should be really checked in ASAP to avoid any triggered DPD checks
to get lost.
This output helps tracing checkout and checkin of IKE_SAs when there is
more than one IKE_SAs with the same name. I also added the type of
in-air-exchange to the debug output issued by the task_manager in case
a task initiation is delayed, came in handy for me.