Rename cutthrough to False Start.

False Start is the name it's known by now. Deprecate the old API and expose new
ones with the new name.

Change-Id: I32d307027e178fd7d9c0069686cc046f75fdbf6f
Reviewed-on: https://boringssl-review.googlesource.com/3481
Reviewed-by: Adam Langley <agl@google.com>
diff --git a/ssl/ssl_lib.c b/ssl/ssl_lib.c
index a4c94dc..348e2a5 100644
--- a/ssl/ssl_lib.c
+++ b/ssl/ssl_lib.c
@@ -2887,8 +2887,12 @@
   return ret;
 }
 
+int SSL_in_false_start(const SSL *s) {
+  return s->s3->tmp.in_false_start;
+}
+
 int SSL_cutthrough_complete(const SSL *s) {
-  return s->s3->tmp.cutthrough_complete;
+  return SSL_in_false_start(s);
 }
 
 void SSL_get_structure_sizes(size_t *ssl_size, size_t *ssl_ctx_size,
@@ -2898,7 +2902,7 @@
   *ssl_session_size = sizeof(SSL_SESSION);
 }
 
-int ssl3_can_cutthrough(const SSL *s) {
+int ssl3_can_false_start(const SSL *s) {
   const SSL_CIPHER *c;
 
   /* require a strong enough cipher */