HOTFIX for travis-ci build environment update
HOTFIX for travis-ci build environment update

An update to the build environment caused
all builds to fail.
https://docs.travis-ci.com/user/build-environment-updates/2016-12-01/#Details

The patch applies fixes given in this issue:
https://github.com/travis-ci/travis-ci/issues/6961
- changes travis script to reflect change of service and
   install path to mysql-5.6
- set password was set for root@localhost
- remove apt install of mysql as it's now in the build
   stack by default

sociomantic/libdrizzle-redux,sociomantic/libdrizzle-redux,sociomantic/libdrizzle-redux