.travis.yml: fix mysql server has gone away, from https://github.com/piwik/piwik/pull/6963/files

.travis.yml

@@ -21,6 +21,12 @@ before_script:
   - sudo apt-get update > /dev/null
   - sudo apt-get install -y --force-yes php5-mysql
 
+  # Try to avoid MySQL has gone away errors
+  - mysql -e "SET GLOBAL wait_timeout = 36000;"
+  - mysql -e "SET GLOBAL max_allowed_packet = 134209536;"
+  - mysql -e "SHOW VARIABLES LIKE 'max_allowed_packet';"
+  - mysql -e "SHOW VARIABLES LIKE 'wait_timeout';"
+
   # Create new site, stubbing sendmail path with true to prevent delivery errors
   - mysql -e 'CREATE DATABASE drupal'
   - export PHP_OPTIONS="-d sendmail_path=`which true`"