completion: list short refs from a remote given as a URL

e832f5c09680 (completion: avoid ls-remote in certain scenarios, 2013-05-28) turned a 'git ls-remote <remote>' query into a 'git for-each-ref refs/remotes/<remote>/' to improve responsiveness of remote refs completion by avoiding potential network communication. However, it inadvertently made impossible to complete short refs from a remote given as a URL, e.g. 'git fetch git://server.com/repo.git <TAB>', because there is, of course, no such thing as 'refs/remotes/git://server.com/repo.git'. Since the previous commit we tell apart configured remotes, i.e. those that can have a hierarchy under 'refs/remotes/', from others that don't, including remotes given as URL, so we know when we can't use the faster 'git for-each-ref'-based approach. Resurrect the old, pre-e832f5c09680 'git ls-remote'-based code for the latter case to support listing short refs from remotes given as a URL. The code is slightly updated from the original to - take into account the path to the repository given on the command line (if any), and - omit 'ORIG_HEAD' from the query, as 'git ls-remote' will never list it anyway. When the remote given to __git_refs() doesn't exist, then it will be handled by this resurrected 'git ls-remote' query. This code path doesn't list 'HEAD' unconditionally, which has the nice side effect of fixing two more expected test failures. Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>