Increase SOAPFactory test coverage.

git-svn-id: https://svn.apache.org/repos/asf/webservices/axiom/trunk@1606522 13f79535-47bb-0310-9956-ffa450edef68
AXIOM-311: Remove redundant test case (now covered by TestCreateSOAPElementWithParent).

git-svn-id: https://svn.apache.org/repos/asf/webservices/axiom/trunk@1606523 13f79535-47bb-0310-9956-ffa450edef68
Javadoc update.

git-svn-id: https://svn.apache.org/repos/asf/webservices/axiom/trunk@1606524 13f79535-47bb-0310-9956-ffa450edef68