Merge branch '2018-08-08-feedback' into 'master'

Feedback from the 2018-08-07 failover attempt

See merge request gitlab-com/migration!191
2 jobs for 748-start-failover-procedure-sh-has-to-be-run-from-migration-dir-make-more-generic in 16 seconds
Status Job ID Name Coverage
  Test
passed #2719896
references

00:00:14

passed #2719895
shellcheck

00:00:16