I've gotten the port to ZoL to the point that it works but am now going to have 
to plow through a bunch of testing issues which may have applicability in 
OpenZFS/illumos as well.

@ahrens The first issue I've run across is the addition of the addition of the 
```vdev_is_concrete()``` check to ```vdev_writeable()```.  This has the 
possibly unintended side-effect of causing a ```zpool clear``` operation to 
generate a bunch of extra events, including kicking off a scrub because pseudo 
top-level vdev is not concrete and that causes ```vdev_clear()```, when called 
from the clear ioctl to enter the "When reopening in response to clear 
event..." when it wouldn't have in the past.    My question is whether this 
behavior is intentional or desired.  It was detected by one of the test suite 
cases in ZoL which perform a bunch of "zpool clear" operations and then count 
the resulting events.

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