FROMLIST: Enable TLS SNI

Upstream submission: https://github.com/ioerror/tlsdate/pull/186

In environments where SSL interception is in place, the SNI field is
often used to figure out whether to enable or disable interception
for a new connection.  Enable SNI on tlsdate requests.

BUG=chromium:400429
TEST=sniff tlsdate's ClientHello message before/after the change, and
     verify that it contains "clients3.google.com" under "Extension:
     server_name"

Change-Id: Ibe6383bd0b9b590a16a08ae8e1b74ee0f401b3f0
Signed-off-by: Kevin Cernekee <cernekee@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/339834
Reviewed-by: Thiemo Nagel <tnagel@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed