[BUILD] travis trusty dist

via <https://github.com/mozilla/treeherder/pull/1080> and <https://blog.travis-ci.com/2015-11-27-moving-to-a-more-elastic-future>

.travis.yml

@@ -1,3 +1,5 @@
+dist: trusty
+
 language: php
 
 branches:

build/travis/mysql-5.6-install.sh

@@ -7,6 +7,6 @@ sudo apt-get remove --purge mysql-common mysql-server-5.5 mysql-server-core-5.5
 sudo apt-get autoremove;
 sudo apt-get autoclean;
 sudo apt-add-repository ppa:ondrej/mysql-5.6 -y;
-sudo apt-get update;
-sudo apt-get install mysql-server-5.6 mysql-client-5.6;
+sudo apt-get update -qq;
+sudo apt-get install -qq mysql-server-5.6 mysql-client-5.6 mysql-client-core-5.6;
 mysql -uroot -e 'SET @@global.sql_mode = NO_ENGINE_SUBSTITUTION; CREATE DATABASE magento_travis;';