crypto/tls: change default minimum version to TLS 1.0.

SSLv3 (the old minimum) is still supported and can be enabled via the
tls.Config, but this change increases the default minimum version to TLS
1.0. This is now common practice in light of the POODLE[1] attack
against SSLv3's CBC padding format.

[1] https://www.imperialviolet.org/2014/10/14/poodle.html

Fixes #9364.

Change-Id: Ibae6666ee038ceee0cb18c339c393155928c6510
Reviewed-on: https://go-review.googlesource.com/1791
Reviewed-by: Minux Ma <minux@golang.org>
diff --git a/src/crypto/tls/common.go b/src/crypto/tls/common.go
index 776b70c..e3c6004 100644
--- a/src/crypto/tls/common.go
+++ b/src/crypto/tls/common.go
@@ -30,7 +30,7 @@
 	recordHeaderLen = 5            // record header length
 	maxHandshake    = 65536        // maximum handshake we support (protocol max is 16 MB)
 
-	minVersion = VersionSSL30
+	minVersion = VersionTLS10
 	maxVersion = VersionTLS12
 )