Optionally skip zil_close during zvol_create_minor_impl

If there were no zil entries to replay, skip zil_close.  zil_close waits
for a transaction to sync.  That can take several seconds, for example
during pool import of a resilvering pool.  Skipping zil_close can cut
the time for "zpool import" from 2 hours to 45 seconds on a resilvering
pool with a thousand zvols.

Reviewed-by: Richard Yao <[email protected]>
Reviewed-by: Alexander Motin <[email protected]>
Reviewed-by: Ryan Moeller <[email protected]>
Sponsored-by: Axcient
Closes #13999 
Closes #14015 

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