pkg: pkg create deadlocks and hangs ZFS host

[Michael Gmelin]

I had pkg crash[1] our build host a couple of times today. I could
reproduce the issue on a local machine and opened a detailed bug
report on github[2] which links to a gist containing the patch that's
also attached to this email.

- Michael

[1] Crash like in "power cycle required".
[2] https://github.com/freebsd/pkg/issues/897

-- 
Michael Gmelin
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