Require TLS 1.2 minimum.
Require TLS 1.2 minimum.

This prevents a downgrade attack to the vulnerable SSLv3.  While here,
go ahead and require at least TLS 1.2 since TLS 1.0 and 1.1 have their
own set of issues and it's only a matter of time before those would
need to be completely avoided as well.

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