Explicitly preclude earlier than TLS 1.2

[woodbe]

The current text would preclude supporting any updates to 1.2, 1.3 or future releases without an update to the Package. This explicitly precludes the use of anything older than 1.2 but would still allow support for future versions without causing problems that may require special operating modes to block certain functions (and potentially break a lot of access).

From the engineers who helped develop TLS 1.3:

If broadly adopted, this would prevent any further development of TLS. TLS 1.3 required many months of experimentation by major clients & servers to measure the real-world behavior of the internet on port 443. This involved running draft versions of TLS 1.3 and resulted in the strange syntactic presentation of TLS 1.3 on the wire, which happens to make it practically deployable. We recommend that, similar to the server rules in FCS_TLSS_EXT.1.1, that this requirement focus only on older versions of TLS.

[woodbe]

This is still applicable to the 2.1 version of the package

[rguthrie1324]

Just added this same change (plus another instance of it for DTLS) into branch 50-fcs_tlsc_ext14-updates): 443ff9d