[CXF-5010] Add customizable request logging capability to STS


Conflicts:
	services/sts/sts-core/src/main/java/org/apache/cxf/sts/operation/AbstractOperation.java
	services/sts/sts-core/src/main/java/org/apache/cxf/sts/operation/TokenCancelOperation.java
	services/sts/sts-core/src/main/java/org/apache/cxf/sts/operation/TokenIssueOperation.java
	services/sts/sts-core/src/main/java/org/apache/cxf/sts/operation/TokenRenewOperation.java
	services/sts/sts-core/src/main/java/org/apache/cxf/sts/operation/TokenValidateOperation.java

git-svn-id: https://svn.apache.org/repos/asf/cxf/branches/wss4j2.0-port@1483714 13f79535-47bb-0310-9956-ffa450edef68