The files that contain the information to handle the integration tests have been created.

For this, the PetsDataset class has been created in order to have test data and verify the correct functioning of the DAO.
In addition, a matcher has been added to compare pets.

- The authentication header has been added to the test of modifying a person's name.
- Updated the name of the PetDAO class to PetsDAO in the Pets resource.

The PeopleResourceTests now include security tests to verify that normal
users can't access people data.