Send kill to sidekiq processes during deployment.

`god terminate` did only work for some processes, because god does not kill them concurrently and gives up after some seconds.
bin/dropbear has never been used
fix internal_iri setter.
Merge pull request #616 from ontohub/fix_iri_extraction

fix internal_iri setter.
Merge branch 'staging' into 538-correct-seeds-for-formality-level-etc
Small cosmetic change.