rebased to phusion/baseimage-docker bionic-1.0.0

[wk]

Pre-Request Checklist

• Passes rubocop code analysis (try rubocop --auto-correct)
• Tests added or adapted (try rake test)
• Changes are reflected in the documentation
• User-visible changes appended to CHANGELOG.md

Description

Rebase the Dockerfile (on which the official container is based) to bionic-1.0.0 release of phusion/baseimage-docker

[codecov-commenter]

Codecov Report

Merging #2130 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2130   +/-   ##
=======================================
  Coverage   63.32%   63.32%           
=======================================
  Files          30       30           
  Lines        1497     1497           
=======================================
  Hits          948      948           
  Misses        549      549           

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