Ported the ServiceIdentification test from Geotk, and fixed XML bugs in this process.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1614181 13f79535-47bb-0310-9956-ffa450edef68
Bug fix: enum shall not be marshalled when null.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1614193 13f79535-47bb-0310-9956-ffa450edef68