[PATCH] git-p4: support exclusively locked files

git-p4 patch

def getP4OpenedType(file):
    # Returns the perforce file type for the given file.

    result = p4_read_pipe(["opened", wildcard_encode(file)])
    match = re.match(".*\((.+)\)(?:.+)?\r?$", result)
    if match:
        return match.group(1)
    else:
        die("Could not determine file type for %s (result: '%s')" % (file, result))