I'm not convinced that you're seeing the same problem:
Looking at the console output (https://jenkins.qa.ubuntu.com/job/mir-ubuntu-vivid-armhf-ci/14/consoleFull) it doesn't appear that the tests are being run on a different host to the build. (And it looks as though gcovr is installed and detected correctly.)
I'm not convinced that you're seeing the same problem:
Looking at the console output (https:/ /jenkins. qa.ubuntu. com/job/ mir-ubuntu- vivid-armhf- ci/14/consoleFu ll) it doesn't appear that the tests are being run on a different host to the build. (And it looks as though gcovr is installed and detected correctly.)