Add Class-Path attribute to jbossws-cxf-client manifest file

The jbossws-cxf-client.jar we produce has a manifest file without the Class-Path attribute (see jbossws-native-client.jar instead). That is required for easy client classpath configuration when not using maven. Perhaps there's even a test for this (in native testsuite, as that would fail in cxf if it's in framework)