Add unit tests for system admin resource-ownership endpoints

Four tests covering the two new endpoints added in the previous commit:

  POST /auth/system/administration/resources/<id>/assign-owner
  POST /auth/system/administration/resources/<id>/revoke-owner

Tests:
  - assign-owner returns 401 when no Authorization header is sent
  - revoke-owner returns 401 when no Authorization header is sent
  - assign-owner returns 403 for a user without system:resource:assign-owner
  - revoke-owner returns 403 for a user without system:resource:assign-owner

The 401 tests exercise the @require_oauth decorator directly.  The 403 tests
mock require_oauth.acquire (same pattern as test_admin_user_roles.py) and use
unaff@iliated.user (TEST_USERS[3]) who has no roles and therefore no
system:resource:assign-owner privilege on the system resource.

Reviewed-By: Frederick M. Muriithi <fredmanglis@gmail.com>

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