Implementation of getCbsdsNotPartOfPpaCluster() does not account for ID format differences

[kate-harrison]

The ID used for individual CBSDs in the FAD is "cbsd/$REFERENCE_ID", but the format used in the cluster list of a PPA is simply "$REFERENCE_ID". The current implementation assumes that these are identical.

Since this code is only used in PPR.3, #876 works around this problem and all tests will have the expected behavior. When the bug is corrected in the implementation of getCbsdsNotPartOfPpaCluster(), the implementation of PPR.3 should be adjusted accordingly.