Changes

fr: kill the frnet container before trying to 'rm' it

+ docker container rm jenkins-ttcn3-fr-test-109-frnet jenkins-ttcn3-fr-test-109-ttcn3-fr-test
jenkins-ttcn3-fr-test-109-ttcn3-fr-test
Error response from daemon: You cannot remove a running container 4f5ec7f412b2d37d00b2738b2bcddffada36efebfe7ce32ed196543ee436154e. Stop the container before attempting removal or force remove

Change-Id: I66ed0d073bdd6962f78da54232d6bc58adc09e2c