Adding support for Kerberos credential delegation


Conflicts:
	src/main/java/org/apache/ws/security/message/token/KerberosSecurity.java
	src/main/java/org/apache/ws/security/processor/BinarySecurityTokenProcessor.java
	src/main/java/org/apache/ws/security/validate/KerberosTokenValidator.java
	ws-security-common/src/main/java/org/apache/wss4j/common/kerberos/KerberosContextAndServiceNameCallback.java
	ws-security-stax/src/main/java/org/apache/wss4j/stax/impl/securityToken/KerberosClientSecurityToken.java

git-svn-id: https://svn.apache.org/repos/asf/webservices/wss4j/branches/1_6_x-fixes@1616162 13f79535-47bb-0310-9956-ffa450edef68
Removing some tabs

git-svn-id: https://svn.apache.org/repos/asf/webservices/wss4j/branches/1_6_x-fixes@1616165 13f79535-47bb-0310-9956-ffa450edef68