Add UsernamePasswordAuthenticationToken factory methods

- unauthenticated factory method
 - authenticated factory method
 - test for unauthenticated factory method
 - test for authenticated factory method
 - make existing constructor protected
 - use newly factory methods in rest of the project
 - update copyright dates

Closes gh-10790

openid/src/test/java/org/springframework/security/openid/OpenIDAuthenticationProviderTests.java

@@ -162,7 +162,8 @@ public class OpenIDAuthenticationProviderTests {
 	public void testIgnoresUserPassAuthToken() {
 		OpenIDAuthenticationProvider provider = new OpenIDAuthenticationProvider();
 		provider.setUserDetailsService(new MockUserDetailsService());
-		UsernamePasswordAuthenticationToken token = new UsernamePasswordAuthenticationToken(USERNAME, "password");
+		UsernamePasswordAuthenticationToken token = UsernamePasswordAuthenticationToken.unauthenticated(USERNAME,
+				"password");
 		assertThat(provider.authenticate(token)).isNull();
 	}