A default implementation of RoleDecoder that delegates decoding of roles for a given AuthorizationIdentity to
an application specific implementation of RoleDecoder, if provided.
A configuration object for a properties resource based realm configuration,
LegacyPropertiesSecurityRealm
It consists of a users.properties that has the format:
user1=password1
user2=password2
and a roles.properties that has the format:
user1=role1,role2,...,roleN1
user2=role21,role2,...,roleN2