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>
The base_prepare() function is now called automatically during test
setup so there is no longer need to call it from each test manually.
Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>