Move SSL management to a distinct private pointer. (#855)

We need to allow our users to use redisContext->privdata as context
for any RESP3 PUSH messages, which means we can't use it for managing
SSL connections.

Bulletpoints:

* Create a secondary redisContext member for internal use only called
  privctx and rename the redisContextFuncs->free_privdata accordingly.

* Adds a `free_privdata` function pointer so the user can tie allocated
  memory to the lifetime of a redisContext (like they can already do
  with redisAsyncContext)

* Enables SSL tests in .travis.yml

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