847: Implement development / debugging flag

Task-Url: https://minfba.de.dariah.eu/mantisbt/view.php?id=847

dariahsp-core/src/main/java/eu/dariah/de/dariahsp/local/LocalAuthenticationProvider.java

@@ -57,6 +57,8 @@ public class LocalAuthenticationProvider implements DebugAwareAuthenticationProv
 	public Authentication getAuthentication() {
 		if (authDebug!=null && (System.getProperty("saml")==null || !Boolean.parseBoolean(System.getProperty("saml")))) {
 			SecurityContextHolder.getContext().setAuthentication(authDebug);
+			// This allows for a global logout of the test user 
+			this.authDebug = null;
 		}		
 		return SecurityContextHolder.getContext().getAuthentication();
 	}