Merge branch 'chef-tutorial' into 'master'

Chef tutorial: generalize, rename, and add to Emulab

See merge request !17
7 jobs for master in 2 minutes and 3 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #2517
apt

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passed #2518
cloudlab

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passed #2519
emulab

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passed #2520
phantomnet

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passed #2521
powder

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  Deploy
passed #2522
pages

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passed pages:deploy

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