* Refactor object and tree service - they should instantiate
chain router cheking the bearer token. If there are no bearer
token rules, then defaul chain router is used.
* Fix unit-tests.
Signed-off-by: Airat Arifullin <a.arifullin@yadro.com>
* Unlike default chain router, `BearerChainFedRouter` performs checks for
overrides defined in the bearer token;
* Add unit-test for the introduced router.
Signed-off-by: Airat Arifullin <a.arifullin@yadro.com>