When the chosen value can't be changed, bacause of some constrain. The function randomly choose diferent valueWhen the chosen value couldn't be changed, because of some constraints. The function randomly chose different value, which is not expected behavior. Now when this event occurs, the function raises ValueError exception and it's handled.
Signed-off-by: NJan Richter <jarichte@redhat.com>

The new version of CIT varianter which support constraints for combinations.
Signed-off-by: NJan Richter <jarichte@redhat.com>

I clearly missed that on 71d915dd, as there's no point of using
a locally defined "basedir" and the one from the sefltests module.
Signed-off-by: NCleber Rosa <crosa@redhat.com>

The data type expected to be given to each yield variant contains the
variant id, the "variant" itself, which should be a list of
TreeNode-like instances, and finally the applicable default search
paths.

The "variant" itself, has to be a list, given that on the very first
varianter implementation, it's supposed to contain one item for each
branch of the tree.
Signed-off-by: NCleber Rosa <crosa@redhat.com>

The Python version used to run Avocado is not being respected in this
test.
Signed-off-by: NCleber Rosa <crosa@redhat.com>

For upcoming release 64.0
Signed-off-by: NCleber Rosa <crosa@redhat.com>

Implementation of the CIT varianter optional plugin.
Signed-off-by: NAmador Pahim <amador@apahim.org>
Signed-off-by: NCleber Rosa <crosa@redhat.com>