Add a test for "val,,ue" with implied key. Documentation says this
should parse as implied key with value "val", then fail. The code
parses it as implied key with value "val,ue", then succeeds. The next
commit will fix it.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201011073505.1185335-3-armbru@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>