Optional parameter minSupportedVersion for tls.createConnection()

[rachid-o]

Added optional paramter minSupportedVersion to tls.createConnection(). This parameter specifies which TLS protocol should be supported at minimum by the other side.
We use this to explicitly disable TLS v1.0.

[dlongley]

Forge 0.7.x (which is presently being developed on this branch that needs renaming: https://github.com/digitalbazaar/forge/tree/buffer-based-api) already has a feature to be explicit about the version you want to use when connecting. It was first introduced here: e12da76, be6a024 but may have a few other changes later down the line.

To get support for this in 0.6.x, a backport that cherry picks what's needed should be performed. If any additional checks are necessary, we can layer those on top.

[dlongley]

There may be some differences in the semantics of 0.7.x's options.version and what's provided here, so a closer look may be required to either reconcile them or ensure all common use cases around selecting a version are supported.

[dlongley]

Replaced by #387.