[BUG] Bzr can't pull bundles from http urls

[Aaron Bentley]

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The http transport requires that relpaths be strings, not unicode.  This
is unlike get_transport, which happily accepts unicode strings.  As a
result,

get_transport(u'http://foo/bar').get('') works, but using urlutils to
split the url, then doing get_transport(u'http://foo').get(u'bar') does not.

The obvious solution would be to use the normalize_path function, but
that will also return unicode, even though such unicode consists of
ascii-range characters.

I believe this is a bug in normalize_path.

Furthermore, normalize_path does not accept urls containing tilde.  This
is a bug IMHO, because tilde is acceptable per RFC 2396.  And it would
be ludicrous to be promoting the use of tilde-containing URLs while
simultaneously claiming that tildes are illegal in URLs.

So this patch changes normalize_path to emit only bytestrings, and to
accept tilde as a safe character.  It also changes read_bundle_from_url
to normalize the url it's passed, so that it's more consistent with
Branch.open_containing.

Aaron
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