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11918 metaslab improvements

Review Request #2442 - Created Nov. 6, 2019 and updated

Information
Jerry Jelinek
illumos-gate
11918
Reviewers
general

This is a port from OpenZFS to illumos of the following metaslab improvements from Delphix:
475aa97ca Prevent metaslab_sync panic due to spa_final_dirty_txg
eef0f4d84 Keep more metaslabs loaded
f09fda507 Cap metaslab memory usage
c81f1790e Metaslab max_size should be persisted while unloaded
fe0ea8481 Don't activate metaslabs with weight 0
679b0f2ab Concurrent small allocation defeats large allocation

zfs test run

Andy Fiddaman
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