repos: fix path if no url, but path given

The `repo` documentation says:
"If the url is missing and the path defined, this entry references the
directory the path points to. [...] In case of a relative path name
`kas_work_dir` is prepended."

But if no `url` is given and a relative path is given in `path`, then
the layer paths being added to `bblayer.conf` are missing the
`kas_work_dir` prefix.

This patch fixes it.

Signed-off-by: Silvano Cirujano Cuesta <silvano.cirujano-cuesta@siemens.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

kas/repos.py

@@ -120,6 +120,10 @@ class Repo:
                 path = Repo.get_root_path(repo_fallback_path)
                 logging.info('Using %s as root for repository %s', path,
                              name)
+            else:
+                if not os.path.isabs(path):
+                    # Relative pathes are assumed to start from work_dir
+                    path = os.path.join(get_context().kas_work_dir, path)
 
             url = path
             disable_operations = True