This change allows the user to use a "--no-overlap" parameter when
running the tool multiple times. It will increase the coverage by
whatever is specified in the dispersion_coverage field of the conf
file in a manner where existing container/objects are left in place
and no partition is populated more than once.
Related-Bug: #1233045
Change-Id: I139fed2f4c967ba18d073b7ecd1e946ed4da1271