418636 Name anonymous filter and holders with classname-hashcode

Conflicts:
	jetty-servlet/src/main/java/org/eclipse/jetty/servlet/ServletHandler.java
	jetty-servlet/src/main/java/org/eclipse/jetty/servlet/ServletHolder.java
	jetty-servlet/src/test/java/org/eclipse/jetty/servlet/ErrorPageTest.java
4 files changed