Add the ability to insert config sections directly

[pirtoo]

Without this ability extra config secrets need to be configured
manually and in an all-helm environment that means an extra chart just
to add a secret. With this addition the config can be put in a local
values file and be used directly by kubed along with the other config
here.

[codecov-io]

Codecov Report

Merging #333 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #333   +/-   ##
=====================================
  Coverage     0.9%   0.9%           
=====================================
  Files           5      5           
  Lines         441    441           
=====================================
  Hits            4      4           
  Misses        437    437

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[tamalsaha]

Thanks @pirtoo !