[fix] Use new SauceConnect provided by Sauce Labs

Could not dowload "Sauce-Connect-latest.zip" anymore, need to change to
new version of SauceConnect.

tests/frontend/travis/sauce_tunnel.sh

@@ -1,13 +1,11 @@
 #!/bin/bash
 # download and unzip the sauce connector
-curl http://saucelabs.com/downloads/Sauce-Connect-latest.zip > /tmp/sauce.zip
-unzip /tmp/sauce.zip -d /tmp
+curl https://saucelabs.com/downloads/sc-latest-linux.tar.gz > /tmp/sauce.tar.gz
+tar zxf /tmp/sauce.tar.gz --directory /tmp
+mv sc-*-linux sauce_connect
 
 # start the sauce connector in background and make sure it doesn't output the secret key
-(java -jar /tmp/Sauce-Connect.jar $SAUCE_USERNAME $SAUCE_ACCESS_KEY -f /tmp/tunnel > /dev/null )&
-
-# save the sauce pid in a file
-echo $! > /tmp/sauce.pid
+(/tmp/sauce_connect/bin/sc --user $SAUCE_USERNAME --key $SAUCE_ACCESS_KEY --pidfile /tmp/sauce.pid --readyfile /tmp/tunnel > /dev/null )&
 
 # wait for the tunnel to build up
 while [ ! -e "/tmp/tunnel" ]