Allow SSLContext ciphers to be customized

[steveny91]

What does this PR do?

We accept a handful of SSL Ciphers. These are:

        "TLS_AES_256_GCM_SHA384", 
        "TLS_CHACHA20_POLY1305_SHA256", 
        "TLS_AES_128_GCM_SHA256",
        "ECDHE-ECDSA-AES256-GCM-SHA384", 
        "ECDHE-RSA-AES256-GCM-SHA384", 
        "ECDHE-ECDSA-AES128-GCM-SHA256",
        "ECDHE-RSA-AES128-GCM-SHA256", 
        "ECDHE-ECDSA-CHACHA20-POLY1305", 
        "ECDHE-RSA-CHACHA20-POLY1305", 
        "ECDHE-ECDSA-AES256-SHA384", 
        "ECDHE-RSA-AES256-SHA384", 
        "ECDHE-ECDSA-AES128-SHA256", 
        "ECDHE-RSA-AES128-SHA256", 
        "DHE-RSA-AES256-GCM-SHA384", 
        "DHE-RSA-AES128-GCM-SHA256", 
        "DHE-RSA-AES256-SHA256", 
        "DHE-RSA-AES128-SHA256"

If someone wants to connect to an endpoint that doesn't use one of the above ciphers, then we'd get an SSL error. Currently, we can't configure this. This PR aims to add the ability to include and configure what Ciphers to allow.

The default behavior:

• Allow all Ciphers ('ALL')
• If configured with specific Ciphers, only allow those Ciphers

Motivation is that for the end user, this should be the most encompassing as they would just not need to care about it out of the box. For users that want to be more strict then they can configure it to do so.

The alternative, is to keep the list from above and allow users to customize it. This will work for some users and other users that uses ciphers not on the list will have to configure it in the config.

I'm open for discussion on the default behavior. Afterwards, I can push the changes to update the config templates.

[codecov]

Codecov Report

Attention: Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.86%. Comparing base (1cb058e) to head (fe86b31).
Report is 6 commits behind head on master.

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