[IMP] tools: display full path in error message

Show full path to not found addons folder to ease debugging.

Before:
error: option --addons-path: no such directory: '../non-existing'

After:
error: option --addons-path: no such directory: '/home/user/Odoo/non-existing'

This message is local to developer and never displayed to the enduser

closes odoo/odoo#68959

Signed-off-by: Martin Trigaux (mat) <mat@odoo.com>

odoo/tools/config.py

@@ -556,7 +556,7 @@ class configmanager(object):
             path = path.strip()
             res = os.path.abspath(os.path.expanduser(path))
             if not os.path.isdir(res):
-                raise optparse.OptionValueError("option %s: no such directory: %r" % (opt, path))
+                raise optparse.OptionValueError("option %s: no such directory: %r" % (opt, res))
             if not self._is_addons_path(res):
                 raise optparse.OptionValueError("option %s: the path %r is not a valid addons directory" % (opt, path))
             ad_paths.append(res)