bundle-uri: limit recursion depth for bundle lists

The next change will start allowing us to parse bundle lists that are
downloaded from a provided bundle URI. Those lists might point to other
lists, which could proceed to an arbitrary depth (and even create
cycles). Restructure fetch_bundle_uri() to have an internal version that
has a recursion depth. Compare that to a new max_bundle_uri_depth
constant that is twice as high as we expect this depth to be for any
legitimate use of bundle list linking.

We can consider making max_bundle_uri_depth a configurable value if
there is demonstrated value in the future.

Signed-off-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

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