i am sending a new diff, again. i apologise for sending 4 different
diffs for this, i definitely should have checked my diff better...

> 1. don't reject protocol versions that is higher than 0x03ff.
> this behavior is useless.

it is if it's checking the clienthello/serverhello version,
but not if we're checking the record layer version! it might
accept non-TLS data if it doesn't check `major version == 0x03`.
add that behavior back for devtls.

also, 2 more problems i saw in version negotiation code:

1. when setVersion fails, code sends a "illegal_parameter" alert
but "protocol_version" is more suitable and the standard way
for this. send "protocol_version" instead.

2. tlsClient2 should abort if the server sends a version higher
than `c->version`. fix up.

the new (and last) diff is attached.