ChannelID support.

Implement ChannelID as both a client and server.
diff --git a/ssl/ssl_sess.c b/ssl/ssl_sess.c
index 5d8b054..206f0b1 100644
--- a/ssl/ssl_sess.c
+++ b/ssl/ssl_sess.c
@@ -1120,4 +1120,15 @@
 	ctx->app_verify_cookie_cb=cb;
 	}
 
+void SSL_CTX_set_channel_id_cb(SSL_CTX *ctx,
+	void (*cb)(SSL *ssl, EVP_PKEY **pkey))
+	{
+	ctx->channel_id_cb=cb;
+	}
+
+void (*SSL_CTX_get_channel_id_cb(SSL_CTX *ctx))(SSL * ssl, EVP_PKEY **pkey)
+	{
+	return ctx->channel_id_cb;
+	}
+
 IMPLEMENT_PEM_rw(SSL_SESSION, SSL_SESSION, PEM_STRING_SSL_SESSION, SSL_SESSION)