Backend support for filtering users

[leelokas]

Similar to api/vacations/filter. It should be possible to filter Users by login, first name, last name, role and manager.

[leelokas]

Still needs doing:

• filtering by role
• returning 'authorities', 'createdDate', 'lastModifiedDate' and 'lastModifiedBy' fields in the response. For example api/users/admin response looks like this:

  { "login": "admin", "firstName": "Administrator", "lastName": "Administrator", "email": "admin@localhost", "activated": true, "langKey": "en", "authorities": [ "ROLE_USER", "ROLE_ADMIN" ], "manager": null, "id": 3, "createdBy": "system", "createdDate": "2016-11-24T17:19:28.235Z", "lastModifiedBy": "system", "lastModifiedDate": "2016-11-24T17:19:28.235Z", "managerId": null, "password": null }

but api/users/filter?login=admin looks like this:

[ { "id": 3, "login": "admin", "firstName": "Administrator", "lastName": "Administrator", "email": "admin@localhost", "activated": true, "langKey": "en", "resetKey": null, "manager": null, "resetDate": null, "fullName": "Administrator Administrator" } ]