DefaultTcpSSLContextSupport Should Use a PathMatchingResourcePatternResolver

The keystore and truststore paths are supplied to this class as Strings, and, for each, a ClassPathResource is created from the String. The documentation states that you can override this default behavior by using, for example "file:" as a prefix.

This does not work without using a PathMatchingResourcePatternResolver to resolve to a Resource of the appropriate type.

In 3.0, we should consider changing the ctor to take Resource objects instead of Strings.