Overview:
  This resource provides external interface to the idmap.

Method DELETE:
  Flush the entire idmap cache.

  Query Arguments:
    filter=[auto|external]
      Filter to apply when deleting identity mappings.
    remove=<boolean>
      Delete mapping instead of flush mapping cache.
    zone=<string>
      Optional zone.

Method POST:
  Manually set or modify a mapping between two personae.

  Query Arguments:
    2way=<boolean>
      Create a bi-directional mapping from source to target and target to
      source.
    zone=<string>
      Optional zone.
    replace=<boolean>
      Replace existing mappings.

