Pin Travis-ci build environment to previous default: Trusty #3923
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Travis-ci changed the default build environment to Xenial as explained in https://blog.travis-ci.com/2019-04-15-xenial-default-build-environment
This causes builds meant for Debian Jessie to break as noted by @wRAR in #3917 (comment)
This change pins the environment to known working ubuntu trusty distribution prior to dropping Jessie support and upgrade to Xenial as base.
Closes #3917
Note: Backport this change to
1.7
branch once it is merged to master.