Add xdotool to ubuntu-trusty; resolves travis-ci/apt-package-whitelist#3605
Add xdotool to ubuntu-trusty; resolves travis-ci/apt-package-whitelist#3605

Packages: xdotool libxdo3 libxdo-dev libxdo3-dbg

travis-ci/apt-package-whitelist,travis-ci/apt-package-whitelist