Update to ECA script to be smarter with reading in commits

Change from using rev-list to cherry for list of commits. Will remove commits already tracked in default branch from checked commits. This should prove to be more accurate than rev-list which did not respect boundaries of branches/tree.

Includes fix for new line characters being randomly added to output after switch over to using hash objects to store commit data directly.

Signed-off-by: Martin Lowe martin.lowe@eclipse-foundation.org