This commit includes some flags for mksquashfs command in other to
achieve higher compression rates. Also note that those flags were
already present in KIWI former versions, thus they have been
included again for compatibility reasons.
This commit fixes#242
overlay disk images uses a readonly root partition and are
overlayed using overlayfs to hook in a cow based read-write
space. This commit implements the basic disk setup.
Implementation to boot such a disk in the kiwi boot code
is still missing, as well as the investigation if dracut
is able to boot such a disk too. References #65
nose is no longer maintained, thus we have to move to another
testing system. This commit updates the tox setup and all tests
to use pytest instead of nose.
