Fix race in vdev_initialize_thread

Before allowing new allocations to the metaslab we need to ensure
that any issued initializing writes have been synced.  Otherwise,
it's possible for metaslab_block_alloc() to allocate a range which
is about to be overwritten by an initializing IO.

Serapheim Dimitropoulos <[email protected]>
Reviewed-by: Richard Elling <[email protected]>
Reviewed-by: Tim Chase <[email protected]>
Reviewed-by: George Wilson <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>
Closes #8461 

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