Make sure the GMT timezone is used if the format is going to mandate that.

git-svn-id: https://svn.apache.org/repos/asf/cxf/trunk@1564454 13f79535-47bb-0310-9956-ffa450edef68
[CXF-5532] Fix problem finding schemas
Patch from  sjaak derksen applied (with modifications for checkstyle)

git-svn-id: https://svn.apache.org/repos/asf/cxf/trunk@1564455 13f79535-47bb-0310-9956-ffa450edef68