This field merges the image variant and arch fields in order to clearly
specify in which images a test case should be executed.

This commit adds this new field to each test case file with the specific
images where it should be executed and updates the tests and format
definition files.

Signed-off-by: Luis Araujo <luis.araujo@collabora.co.uk>

This commit adds support to have multiple image variants in the test
cases files.

It also adds the respective image variants list relevant to each test
case.

This commit also updates the tests files and format definition files.

Signed-off-by: Luis Araujo <luis.araujo@collabora.co.uk>

This is a madantory field that specifies the deployment type of the
image where this test case can be executed.

The commit adds the image-deployment field for each test case, and it
currently can be a list with the following values: APT, OSTree, Any.

This commit also updates the tests files.

Signed-off-by: Luis Araujo <luis.araujo@collabora.co.uk>

This commit renames the image-type field to image-variant
in the test cases files.

It also updates the parser, renderer code, test_case template
and unittests files in order to use the new name.

Signed-off-by: Luis Araujo <luis.araujo@collabora.co.uk>

Signed-off-by: Luis Araujo <luis.araujo@collabora.co.uk>

- Update the README listing existing macros and how to
  use the renderer.
- Rename the main program to render-test-case
- Rename the tc directory to tests-cases

Signed-off-by: Luis Araujo <luis.araujo@collabora.co.uk>

Signed-off-by: Luis Araujo <luis.araujo@collabora.co.uk>