Isolate Delta Report performance test data

Isolate Delta Report performance test data

- Delta report performance tests shared openroadm anchor with other
  performance tests in CPS.
- The patch removes the use of openroadm anchors for Delta Report
  performance tests.
- Delta Report performance tests now use two independent anchors as
  source and target: delta-report-anchor and openroadm-modified.
- Both the anchors are deleted once the Delta Report tests finish
  executing.
- Removed @Ignore from first Delta Report test to check if there is any
  impact on other CPS performance tests.

Issue-ID: CPS-3092
Change-Id: Ib1107329973d58cb4b90091f4983d3f42e07a3d7
Signed-off-by: Arpit Singh <AS00745003@techmahindra.com>