MNT: Purge Travis CI settings before debian 9.
MNT: Purge Travis CI settings before debian 9.

frib-high-level-controls/FLAME,frib-high-level-controls/FLAME,frib-high-level-controls/FLAME,frib-high-level-controls/FLAME,frib-high-level-controls/FLAME,frib-high-level-controls/FLAME