add zstd support

To test:

• Créer l'archive zstd
  • cd kadeploy/vagrant-env/envs
  • zcat debian9-x64-min-2020090209.tgz > zstd > debian9-x64-min-2020090209.zstd
• A l'intérieur du vagrant, récupérer une image de l'env de déploiement qui contient zstd
  • vagrant@kadeploy> wget http://public.nancy.grid5000.fr/~amerlin/kadeploy3-deploy-kernel-buster_1.20201123_all.deb
  • vagrant@kadeploy> sudo dpkg -i kadeploy3-deploy-kernel-buster_1.20201123_all.deb
  • vagrant@kadeploy> sudo cp /grid5000/kadeploy-kernels/kadeploy3-deploy-kernel-buster.{vmlinuz,initrd.img} /srv/tftp/kernels
• Add the zstd environment:
  • vagrant@kadeploy> kaenv3 -a /vagrant/envs/debian9-x64-min-zstd.dsc
• deploy it:
  • vagrant@kadeploy> kadeploy3 -m node-1 -e debian9-x64-min-zstd -V5 -r ext4

• Ajout de zstd (compression: zstd dans les envs)
• Ajout de la possibilité de mettre des options pour les compressions

#server.conf
external:
  mkfs:
   - args: blabla
     fstype: ext4
  compression_options:
   - args: -T0
     type: zstd

added 1 commit

• af7e644a - Add support for zstd and compression args config

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added 2 commits

• 8a8500f7 - raise error on incorect compression type in config
• 69b2d88f - raise error on dupplicate defintion of cluster in config

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added 1 commit

• ec22cab2 - Fix typo to correctly return error

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unmarked as a Work In Progress

changed the description

assigned to @neyron

added 2 commits

• 5a074acc - [kaenv3] allo listing long name env
• c761f6fd - [common/env] return no description as an empty string

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added 1 commit

• b1165038 - [server/workflow] print env in log when it's a deployment

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added 1 commit

• 90986085 - [server/microstep] add 1777 right when formating tmp partition

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added 14 commits

• 90986085...dd64fd0c - 6 commits from branch master
• 7b5e7e80 - Add support for zstd and compression args config
• 980cd7b0 - raise error on incorect compression type in config
• 88b2eed6 - raise error on dupplicate defintion of cluster in config
• 0641571c - Fix typo to correctly return error
• a75aea42 - [kaenv3] allo listing long name env
• 42d44705 - [common/env] return no description as an empty string
• d941d0d7 - [server/workflow] print env in log when it's a deployment
• 332d37af - [server/microstep] add 1777 right when formating tmp partition

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merged

mentioned in commit 687459df