AuthXmlHandler: support login via accessToken method
AuthXmlHandler: support login via accessToken method

Based on the attribute, we decide which Credentials instance to create
and pass to the AuthService. Supporting both AuthCodeCredentials and
AccessTokenCredentials does not mean that it is implemented in the
selected AuthProvider.

Signed-off-by: Jan Viktorin <3eab6ac54c005c4408f608556a6663b7f2abede7@fit.vutbr.cz>

BeeeOn/server,BeeeOn/server,BeeeOn/server,BeeeOn/server