Signed-off-by: NCleber Rosa <crosa@redhat.com>

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

The "paths" is supposed to be a list of paths and not just string.
Fortunatelly this was why this plugin actually worked, because it turned
paths into `['/', 'r', 'u', 'n']` making the root node available. Anyway
let's fix the value and use the only location this plugin puts variables
in, which is `/`.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

This plugin uses flat structure, there is no need to set the default
path.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

There was a minor bug/inconsistency in "to_str" method where
"self.parameter_path" is returned instead of list of leaves. Instead of
fixing it let's use the built-in "varianter.to_str" which uses the
"usual" implementation.
Signed-off-by: NLukáš Doktor <ldoktor@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>