crypto/tls: update bogo version

This commit updates the pinned revision of BoringSSL that's used for the
BoGo integration test.

Doing this requires a few categories of config changes:

* ignoring a few new tests for features crypto/tls doesn't implement
* ignoring a few new tests that require further
  investigation/classification, or that already have an associated
  tracking issue
* updating the error map syntax to accommodate the upstream change that
  allows a one-to-many mapping

One code change is required in the shim test process to adjust how we
tear down a connection after an error to account for an upstream change
in the test runner.

Previously, for error conditions we would immediately close the
connection when exiting the shim process. We instead need to do this in
a multi-step process:

1. Flush any pending TLS writes to surface any alerts the error
   condition may have generated.
2. Close the write side of the TCP connection to signal we're not
   writing anymore.
3. Read and discard any pending data from the peer.
4. Close the read side of the TCP connection to fully close the socket.

Without doing this unpredictable timing factors may result in spurious
test failures where:

1. The runner sends us data that produces an error.
2. We send an alert, and immediately tear down the connection.
3. The runner tries to perform a write, and hits an error because the
   pipe is closed.
4. The runner fails the test with the pipe write error, before it reads
   from the connection to see the expected alert.

With the new code we instead swallow the unrelated writes and the runner
sees our alert after its ignored write when it tries to read from the
conn. The alert is the expected test outcome, and so the test passes.

This was previously not an issue because the runner was discarding the
write errors.

Updates #72006

Change-Id: Ib72a1c5e693aac92144696c8bae888d5f3f6c32f
Reviewed-on: https://go-review.googlesource.com/c/go/+/683456
Auto-Submit: Daniel McCarney <daniel@binaryparadox.net>
Reviewed-by: David Chase <drchase@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>

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