Clean ZFS spa config before syncing

A number of entries that can be present in the spa config shouldn't be saved
to disk so add a method to ensure this is case. Without this if the last
caller to vdev_config_generate requested stats then we can end up in the
cache file.

Also only skip a none writable pool in the cache file generation if its
active. This prevents unavailable pools incorrectly getting removed from
cache file.

Tested by:	delphij
MFC after:	2 weeks
Sponsored by:	Multiplay

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