MFV r337197: 9456 ztest failure in zil_commit_waiter_timeout
illumos/illumos-gate@b6031810da58df96413bf76e068638fcab1f228a
Reviewed by: Matt Ahrens <matt@delphix.com>
Reviewed by: Serapheim Dimitropoulos <serapheim.dimitro@delphix.com>
Approved by: Matt Ahrens <mahrens@delphix.com>
Author: Prakash Surya <prakash.surya@delphix.com>