CXF clients do not fall back to use the javax.net.ssl.trustStore System property

If a CXF Client has no TLSClientParameters object defined (or an empty one), it falls back to use the default Java TrustManagers. Instead it should first check to see whether the System Properties "javax.net.ssl.trustStore" and "javax.net.ssl.trustStorePassword" have been set and use these instead.