scripts: fix shell scripts according to shellcheck errors

Unify coding style of shell scripts in accordance with
shellcheck errors.

Signed-off-by: Ruslan Mstoi <ruslan.mstoi@intel.com>

scripts: more compatible shebangs

Signed-off-by: Philipp Schuster <philipp.schuster@cyberus-technology.de>

ci: Add OpenAPI validation

We need to validate that OpenAPI YAML definition is not broken by each
and every pull request. The easiest way is to rely on the Docker image
provided by OpenAPITools, as

ci: Add OpenAPI validation

We need to validate that OpenAPI YAML definition is not broken by each
and every pull request. The easiest way is to rely on the Docker image
provided by OpenAPITools, as it allows us to validate the definition
with one simple command.

Signed-off-by: Sebastien Boeuf <sebastien.boeuf@intel.com>

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