Finish Airship test jobs

It removes all debug data as all logs are now well published [1] and
results pushed to DB [2].

It should be noted that the two agents are configured with
/home/jenkins/opnfv/slave_root/workspace instead of
/home/jenkins-ci/workspace (see Functest Kubernetes slaves).

[1] http://testresults.opnfv.org/test/api/v1/results?installer=airship&last=1
[2] http://artifacts.opnfv.org/airship/airship-opnfv-functest-healthcheck-hunter-connection_check-run-7/results/functest.log

Change-Id: I103bd68eb62bb5bf9c13a1f706ddf0528f874542
Signed-off-by: Cédric Ollivier <cedric.ollivier@orange.com>