- Bump version: 9.24.30 → 9.24.31

- Fix LABEL detection (#2112)
When only "root=" is specified on the kernel command line the match is
located in the first group. Loop through the groups upon mtach to find
what we are looking for.

- Preserve LABEL setting (#2108)
Preserve the LABEL= setting when the grub config file is re-generated.
the GRUB_ENABLE_LINUX_LABEL setting does not exists upstream and
not in any SUSE distribution. Set the grub setting such that LABEL
is preserved on SUSE distros. (bsc#1197616)

- Fix test_setup_default_grub_empty_kernelcmdline
The unit test exists to check that GRUB_CMDLINE_LINUX_DEFAULT
is not set depending on the provided cmdline. The test exists
for reasons explained in Issue #1650

- Don't compress .appx containers (#2106)
The container is actually inside and already compressed.

- Added new CloneDevice class
Added CloneDevice class to the storage interface.
The class allows to create clone(s) from a given source
block device into a list of target block devices.
The target block devices are clones of the source but
prevents device naming conflicts for unique identifiers
like the UUID. This is requires to still allow to boot
from images containing device clones and needs to be
handled by tools that might work on top of the cloned