[CXF-5200] - Support newer signature algorithms in WS-SecurityPolicy (such as RSA-SHA256)


Conflicts:
	rt/ws/security/src/main/java/org/apache/cxf/ws/security/wss4j/PolicyBasedWSS4JInInterceptor.java
	rt/ws/security/src/main/java/org/apache/cxf/ws/security/wss4j/PolicyBasedWSS4JOutInterceptor.java
	rt/ws/security/src/main/java/org/apache/cxf/ws/security/wss4j/PolicyBasedWSS4JStaxInInterceptor.java
	rt/ws/security/src/main/java/org/apache/cxf/ws/security/wss4j/policyhandlers/StaxAsymmetricBindingHandler.java
	rt/ws/security/src/main/java/org/apache/cxf/ws/security/wss4j/policyhandlers/StaxSymmetricBindingHandler.java
	rt/ws/security/src/main/java/org/apache/cxf/ws/security/wss4j/policyhandlers/StaxTransportBindingHandler.java
	systests/ws-security/src/test/java/org/apache/cxf/systest/ws/x509/StaxX509TokenTest.java
	systests/ws-security/src/test/resources/org/apache/cxf/systest/ws/x509/stax-server.xml

git-svn-id: https://svn.apache.org/repos/asf/cxf/branches/2.7.x-fixes@1513893 13f79535-47bb-0310-9956-ffa450edef68