[WSS-510] - Provide a way of requiring a particular SAML subject confirmation method


Conflicts:
	src/main/java/org/apache/ws/security/validate/SamlAssertionValidator.java
	src/test/java/org/apache/ws/security/saml/SamlTokenTest.java
	ws-security-stax/src/main/java/org/apache/wss4j/stax/impl/processor/input/SAMLTokenInputHandler.java
	ws-security-stax/src/main/java/org/apache/wss4j/stax/validate/SamlTokenValidatorImpl.java
	ws-security-stax/src/test/java/org/apache/wss4j/stax/test/saml/SAMLTokenTest.java

git-svn-id: https://svn.apache.org/repos/asf/webservices/wss4j/branches/1_6_x-fixes@1624263 13f79535-47bb-0310-9956-ffa450edef68