We do not actually Mysql 5.6 to test with STRICT_TRANS_TABLES enabled…

…. Refs matomo-org#5178

.travis.yml

@@ -78,18 +78,6 @@ matrix:
 script: ./travis.sh
 
 before_script:
-  # Setup Mysql 5.6 (source: https://github.com/travis-ci/travis-ci/issues/1986)
-  - "sudo apt-get remove mysql-common mysql-server-5.5 mysql-server-core-5.5 mysql-client-5.5 mysql-client-core-5.5"
-  - "sudo apt-get autoremove"
-  - "sudo apt-get install libaio1"
-  - "wget -O mysql-5.6.14.deb http://dev.mysql.com/get/Downloads/MySQL-5.6/mysql-5.6.17-debian6.0-x86_64.deb/from/http://cdn.mysql.com/"
-  - "sudo dpkg -i mysql-5.6.14.deb"
-  - "sudo cp /opt/mysql/server-5.6/support-files/mysql.server /etc/init.d/mysql.server"
-  - "sudo ln -s /opt/mysql/server-5.6/bin/* /usr/bin/"
-  - "sudo sed -i'' 's/table_cache/table_open_cache/' /etc/mysql/my.cnf"
-  - "sudo sed -i'' 's/log_slow_queries/slow_query_log/' /etc/mysql/my.cnf"
-  - "sudo sed -i'' 's/basedir[^=]\\+=.*$/basedir = \\/opt\\/mysql\\/server-5.6/' /etc/mysql/my.cnf"
-  - "sudo /etc/init.d/mysql.server start"
   - mysql --version
   - mysql -e "SELECT VERSION();"
   # Enable sql_mode STRICT_TRANS_TABLES as it is the new default in Mysql 5.6