Add some separators to easily see disks.
Add vm and detach options to disk.

 --vm will attach the disk to a vm (first detaching if needed)
 --detach will only detach the disk
Update man page for gandi disk update.
Add a confirm for detach chen attaching to another vm.
Add some information about detaching when using --vm in gandi disk update.
Change option order in the description to be clearer.
Merge branch 'stable'
Merge branch 'stable'
Merge branch 'stable'
Merge branch 'stable'
Fix attached disk detection.
Implement detach method in disk module.
Implement disk detach command.
Implement attach method in disk module.
Implement disk attach command.
Remove previous changes to have disk attach and detach in update.
Update man page for new way to attach and detach disks.
Cannot ssh to a VM without a valid IP address
Merge branch 'disk_adv'
disk: fix default value when creating a disk

Since we introduced a SizeParamType, default value should be a string

This fixes the following TB:
TypeError: 'int' object is not iterable

Signed-off-by: William Dauchy <william@gandi.net>