Test for preserving partitions from core device.
Test for preserving partitions at core device, which were made on exported object,
after stopping cache.
Also added two fields to 'Core' class which allows it to use 'create_partitions' function.
Signed-off-by: Slawomir Jankowski <slawomir.jankowski@intel.com>
Rename set_statistics_deprecated to set_statistics_flat, as flat
statistics are sometimes more useful and actually not deprecated.
Signed-off-by: Daniel Madej <daniel.madej@intel.com>
