Move the decision whether the root fs should be mounted ro or rw
into the pipeline configuration.
Update the pipelines accordingly.
Signed-off-by: Tom Gundersen <teg@jklm.no>
The testing script is getting too big and not very well organized. In
this commit a new module `integration_tests` is introduced that contains
parts of the original testing script split into multiple files. The
content should be the same, the only difference is that now you can run
the tests by invoking `python3 -m test`.