BIS-774: Rewriting callbacks to promises. Fixed the issue with not working login page.

...-server-javascript/src/js/api/server-data-store-facade.js

...-server-javascript/src/js/demo/server-data-store-login.js

...re/src/main/resources/server-data-store-config.properties

...ta-store/src/test/resources/test-server-config.properties

...rc/test/resources/test-server-with-auth-config.properties