Allow to use a script for formating operations

• The script is not mandatory, if none is specify, kadeploy does what it was doing before
• One script for the 3 formating operation (deploy, tmp, swap) controlled via env variable
• The proposed script reuse UUID for swap and tmp partition since they are used on fstab and shared between prod & deploy env on grid'5000

ca me semble bien

added 1 commit

• 1001b331 - [microsteps+config] Allow to use a script for formating operations

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merged

mentioned in commit c03459d2