Merge "Adding one more test to survival metric"

Change-Id: I490e6b11ffd67c771f4b099ecf1a53a0a049e319
cleanup of flake8 problems

Change-Id: Ica8ce03da7d85148cf4aa7cba671182974271f64
Merge branch 'master' of ssh://gerrit.wikimedia.org:29418/analytics/wikimetrics

Change-Id: Ibdef7504e7e3b0042073866cd01f61396ec22ed2