SSL access to Hot Rod

Investigate and integrate Adrian's patch for Hot Rod server so that it can accessed via SSL.

Email from Adrian:

"While I remember heres a patch to add ssl for infinispan clients.
I did it a couple of weeks ago, but I dont know when Ill have time
to finish it off/polish it. It was based on head a few weeks ago,
but I dont remember which version.

The horrible part is the way I had to modify all the parameter lists.
It could really do with passing some config object instead.

I dont know how to make "git diff" include new uncommitted files so Ive attached them
seperately.

See the test for how to use it, but it is basically set the config properties
(with the relevant infinispan package prefixes)
use_ssl=true
key_store_file_name=jks file containing our key
key_store_password=secret
trust_store_file_name=jks file containing public keys we trust for authentication
trust_store_password=another-secret

Optionally you can get the server to authenticate the client as well

need_client_auth=true

which means the server will need a trust store.

I've also left it so if you dont set the properties it will use the default implementations.
But this doesnt work out of the box unless you enable the "anon" alogorithms on
the server, they aren't enabled by default. Those dont authenticate, they just encrypt the traffic.

The main thing left to do would be change the test to get maven to generate the
key/trust store in a well defined place in "target".

Other comments:

• The code on the serrver will also work for other protocols as well, e.g. memcached
  if the client supports ssl

• The ssl context construction is pretty similar in the client/server
  and could probably be shared if I knew where to put shared stuff in the codebase.

• There is some commented out bits where I think the client/server should really
  be adding socket timeouts. Otherwise network drops/splits could cause the connection
  to hang forever. There should at least be a connection timeout on the socket construction,
  if you dont want to implement a full blown ping to continually test the connection rather
  than just ping on start - which doesnt run until after the connection timeout is needed.

• I had to modify the system property handling so you can have a default of "null".
  I only did this for Strings, might not be relevant for others?

• Why doesnt the client side do system property replacement like the server?

• Theres a lot of places in the code doing

InputStream is = openStream();
useIt(is);

but never close the stream. While this is probably ok in infinispans use cases
it is not good practice to leave files open for the gc to close - that could take a while
to happen and you are hogging system resources.

Either useIt() should close the stream or the code should be

InputStream is = openStream();
try {
useIt(is);
}
finally {
is.close();
}

Feel free to post whatever parts of this message you like in the infinispan forum. "