cleanup test, reuse code for install/remove a caching factory

Files:
modified: /webservices/axis2/trunk/java/modules/jaxws/test/org/apache/axis2/jaxws/spi/ClientMetadataTest.java (try)
modified: /webservices/axis2/trunk/java/modules/jaxws/test/org/apache/axis2/jaxws/client/dispatch/DynamicPortCachingTests.java (try)