Format cookies into the backing store string without encryption as they
will not be visible on the command line when formatting a 'target' only
string. In cases when cookies or other options are used we must use the
JSON format rather than pure URI.

Add tests to validate the scenario.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>