[CXF-5048] - StaticSTSProperties class requires a CXF message context to initialize using configure() method


Conflicts:
	services/sts/sts-core/src/main/java/org/apache/cxf/sts/StaticSTSProperties.java

git-svn-id: https://svn.apache.org/repos/asf/cxf/branches/2.7.x-fixes@1538620 13f79535-47bb-0310-9956-ffa450edef68