Additional linting in meta-layer repotest

[Patrick Williams <patrick@stwcx.xyz>]

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Hello,

Ed recently added a test-phase called 'repotest'[1,2] in the openbmc/openbmc
repository that allows us to perform sanity checking on commits at that level
beyond a simple "does this compile".  The initial checking he added was to
ensure that no new patches are added to the tree (in violation of our meta-layer
coding guidelines).

I'm adding[3] additional capabilities to this script to enable linting in the
repository.  This will run `shellcheck` for shell scripts and `eslint` for JSON
(Some might be unaware that Manoj added JSON linting with `eslint` as part of
our normal unit-test / formatting scripts[4] as well).  Once this is in place
new commits will fail CI if they add new shellscripts that violate `shellcheck`
rules or JSON with invalid parsing.

Currently, there is quite an extensive list of 'exempted' scripts (~100) which
already fail `shellcheck` rules.  It is quite likely that some of these are
real bugs, so I would strongly urge if you are the maintainer of one of the
meta-layers holding an 'exempted' script that you look over the `shellcheck`
failures.  Hopefully over the next few months we will greatly reduce the number
of scripts in this exemption list by cleaning up the issues.

1. https://lore.kernel.org/openbmc/CAH2-KxDe6hR1V-Lz1k8cdD11jEquy4UhR4LfLhg37E5EG42EJg@mail.gmail.com/
2. https://github.com/openbmc/openbmc/blob/master/meta-phosphor/scripts/run-repotest
3. https://gerrit.openbmc-project.xyz/c/openbmc/openbmc/+/48349
4. https://github.com/openbmc/openbmc-build-scripts/blob/master/scripts/format-code.sh#L31
-- 
Patrick Williams

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