Config UI: Add detail to cleanup/dispose stage names

The advanced config backend generates descriptive
names for main stages today, but not for the cleanup
and dispose stages. This patch adds the missing
detail (object size, #containers, #objects,
as well.

This addresses issue#190

Signed-off-by: Khushbu Shrivastava <khushbu.shrivastava@intel.com>
    Config UI: Change stage summary to include stage progress, running time

    Decription: The stage summary today shows just the stage name or a sequence of names in case there are multiple workloads
                For brevity, it should show -
                name of the current stage
                stage#/total stages
                time remaining in the current stage
                Also, possibly -
                time elapsed since the start of the test
                total estimated time for the test run

    This addresses issue#192

Signed-off-by: Khushbu Shrivastava <khushbu.shrivastava@intel.com>