[Patch] Updated support for external command handlers

[Aaron Bentley]

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Michael Ellerman wrote:
| +        for dir in bzrpath.split(':'):
| +            path = os.path.join(dir, cmd)
| +            if os.path.isfile(path):
| +                return ExternalCommand(path)

Since subcommands may be delivered as bzr trees, I think it would be
nice to support subdirectories in bzrpathdirs.

e.g. (untested code)

def iter_bzrdirs(bzrpath)
~  for dir in bzrpath.split(':'):
~    yield dir
~    for subdir in listdir(dir)
~      path = os.path.join(subdir)
~      if os.path.isdir(path):
~        yield path


for dir in iter_bzrdirs(bzrpath):
~    path = os.path.join(dir, cmd)
~    if os.path.isfile(path):
	return ExternalCommand(path)
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