completion: simplify __git_remotes()
completion: simplify __git_remotes()

The __git_remotes() helper function lists the remotes from the config
file by processing the output of a 'git config' query.  A simple 'git
remote' produces the exact same output, so run that instead.

Remotes under '$GIT_DIR/remotes' are still listed by running 'ls -1',
because 'git remote' unfortunately ignores them.

Signed-off-by: SZEDER Gábor <46692b1f0516358b02a6405518c0a52aa8fb3e94@ira.uka.de>
Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git