bundle-uri: create base key-value pair parsing

There will be two primary ways to advertise a bundle list: as a list of
packet lines in Git's protocol v2 and as a config file served from a
bundle URI. Both of these fundamentally use a list of key-value pairs.
We will use the same set of key-value pairs across these formats.

Create a new bundle_list_update() method that is currently unusued, but
will be used in the next change. It inspects each key to see if it is
understood and then applies it to the given bundle_list. Here are the
keys that we teach Git to understand:

* bundle.version: This value should be an integer. Git currently
  understands only version 1 and will ignore the list if the version is
  any other value. This version can be increased in the future if we
  need to add new keys that Git should not ignore. We can add new
  "heuristic" keys without incrementing the version.

* bundle.mode: This value should be one of "all" or "any". If this
  mode is not understood, then Git will ignore the list. This mode
  indicates whether Git needs all of the bundle list items to make a
  complete view of the content or if any single item is sufficient.

The rest of the keys use a bundle identifier "<id>" as part of the key
name. Keys using the same "<id>" describe a single bundle list item.

* bundle.<id>.uri: This stores the URI of the bundle item. This
  currently is expected to be an absolute URI, but will be relaxed to be
  a relative URI in the future.

While parsing, return an error if a URI key is repeated, since we can
make that restriction with bundle lists.

Make the git_parse_int() method global so we can parse the integer
version value carefully.

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

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