420530 AbstractLoginModule never fails a login

Conflicts:
	jetty-jaas/src/main/java/org/eclipse/jetty/jaas/spi/AbstractLoginModule.java
	jetty-jaas/src/main/java/org/eclipse/jetty/jaas/spi/PropertyFileLoginModule.java
Merge remote-tracking branch 'origin/master' into jetty-9.1