CI Doesn't Properly Reflect Testing/Released

[mikeferguson]

Current situation:

• message_filters version in the "testing" debian repository: 6.0.3 (has the hpp headers)
• message_filters version in the "ros2" debian repository: 6.0.0 (no hpp headers)
• Both the "build-rolling" and "build-rolling-testing" PRs are passing
• If you install debians locally and do not have a source install of message_filters, you find out very quickly that the rolling branch does not build, since you have no hpp headers available.

It would appear to me that the CI is using the testing debians for both jobs. Thoughts @ahcorde?

[mikeferguson]

https://github.com/osrf/docker_images notes that osrf/ros2:testing (which is the base repo for both the testing and non-testing job) uses the testing repo

[mikeferguson]

Possible solution in #1020