have setup-disk to use ext4 as default filesystem

ext4 has support for fast mkfs.

(from redmine: issue id 558, created on 2011-03-24, closed on 2011-04-13)

• Changesets:
  • Revision 20a9a27018f8c68c5b01a41f3d66e4920bd50049 by Natanael Copa on 2011-03-24T18:29:03Z:

setup-disk: use ext4 for / and /boot by default

ref #558