v2 First patch series for the roadmap item "Get rid of CONFIG_TYPE in the network config"

[Jonatan Schlag <jonatan.schlag@ipfire.org>]

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Hi list,

This is the second version of the first patch series for the roadmap item: https://www.ipfire.org/docs/roadmap/get-rid-of-configtype-in-network-config . This patch series introduces a bash testing library and a function readhash, which we will use in every bash script which needs to read our config files.
As this patch set is already massive, I thought it might be better to discuss the function first before I introduce it in every script.
Otherwise, we would talk about 50 patches and not 18. This amount would be somehow not reviewable.

I kept the [[ over the single [, as from my point of view these are far
more intutive. No pathname expansion or word splitting takes place in [[
which is the saver option. See also https://google.github.io/styleguide/shellguide.html#test----and--- 

Patches in this series are:

  # The first 9 patches introduce a bash testing library
  [PATCH v2 01/18] tests: Add bash lib
  [PATCH v2 02/18] tests/lib.sh: Add function test_value_in_array
  [PATCH v2 03/18] tests/lib.sh: Add check if variable exists to
  [PATCH v2 04/18] tests/lib.sh: Add logging functions
  [PATCH v2 05/18] tests/lib.sh: adjust to pytest logging style
  [PATCH v2 06/18] test_value_in_array: Check if the key is defined
  [PATCH v2 07/18] tests: Add function to test the ouput of a bash
  [PATCH v2 08/18] test: Add functions test_that_array_is_defined
  [PATCH v2 09/18] tests: Add functions test_that_array_doesnt_have_key
  # The next patch add the readhash function
  [PATCH v2 10/18] initscript functions: add readhash
  # The next 5 Patches are concerned with error handling
  [PATCH v2 11/18] initscript fkt: ignore blank lines in readhash
  [PATCH v2 12/18] initscripts fkt: Ignore comments in readhash
  [PATCH v2 13/18] initscripts fkt: ignore invalid keys in readhash
  [PATCH v2 14/18] initscripts fkt: Check for invalid values in readhash
  [PATCH v2 15/18] initscripts fkt: readhash should only parse lines with a =
  # The title says it all:
  [PATCH v2 16/18] initscripts fkt: keep readhash compatible with older
  # Keep my linter happy
  [PATCH v2 17/18] initscripts fkt: Fix shebang
  # Check that we fail on a missing file
  [PATCH v2 18/18] initscripts fkt: Check that readhash returns 1 on a