Configure Jenkins to use debian-jessie based buck-slave

Since change 184713 the docker image of the buck-slave is based
on debian jessie. The image was tagged 'debian-jessie', but the
configuration-file of Jenkins was not updated to use the updated
image.

This change updates the configuration accordingly.

Change-Id: I1297780ebeaed8c739727ddbce36207db6ccd0cf
1 file changed
tree: 811ff59033b00331049ac3bdf1f2aa51cf6b1dcb
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore