Api: Speaker-test

[andySigler]

overview

Adds alsa-utils to the Dockerfile. This gives us control over audio output, as well as a tool for QC'ing machines' speakers.

To test speaker from Resin Terminal or when ssh'ed into machine:

$ speaker-test

That will play pink-noise from speaker until quit using Ctrl-C

[codecov]

Codecov Report

Merging #1039 into edge will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             edge    #1039   +/-   ##
=======================================
  Coverage   50.46%   50.46%           
=======================================
  Files         191      191           
  Lines        3230     3230           
  Branches      342      342           
=======================================
  Hits         1630     1630           
  Misses       1511     1511           
  Partials       89       89

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[btmorr]

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