[Merge] lp:~xnox/partman-auto/avoid-hung-blkid into lp:~ubuntu-core-dev/partman-auto/ubuntu

[Dmitrijs Ledkovs]

Yes, other types of hfs should also be excluded.
Switched to egrep, re-read word-splitting guide and hopefully the quoting is correct now.
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https://code.launchpad.net/~xnox/partman-auto/avoid-hung-blkid/+merge/139450
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