Return an instance of of the security protocol from the port object. This
is only supported on standalone proxies
StatelessArrayWSSi si = ws.getNonePort();
ConsumerSecurityProtocolInterface cspi = ConsumerSecurityProtocolFactory.getSecurityProtocol(si);
AuthenticationContextInterface aci = cspi.getClientAuthenticationContext();
aci.setPassword(password);
aci.setUsername(user);