Adding XKMS validate caching + some caching unit tests


Conflicts:
	services/xkms/xkms-client/src/main/java/org/apache/cxf/xkms/crypto/XkmsCryptoProvider.java

git-svn-id: https://svn.apache.org/repos/asf/cxf/branches/2.7.x-fixes@1516255 13f79535-47bb-0310-9956-ffa450edef68
Recording revisions 1516245 via  git from
https://svn.apache.org/repos/asf/cxf/trunk



git-svn-id: https://svn.apache.org/repos/asf/cxf/branches/2.7.x-fixes@1516256 13f79535-47bb-0310-9956-ffa450edef68
Blocking revisions 1514647,1515771 via  git from
https://svn.apache.org/repos/asf/cxf/trunk



git-svn-id: https://svn.apache.org/repos/asf/cxf/branches/2.7.x-fixes@1516257 13f79535-47bb-0310-9956-ffa450edef68