Deprecate git-fetch-pack?

Now that git-fetch is in C, built in, and doing the fetch-pack in the same process, the normal usage patterns don't involve actually executing git-fetch-pack. Can we deprecate it at this point, or it is plausibly being used by scripts? As it is now, I'm not entirely confidant that the tests in t5500 won't be fooled by git-fetch working even with git-fetch-pack being broken in various ways, which should be fixed if we want to keep it.

We also might as well deprecate peek-remote now that it's a synonym for ls-remote.

	-Daniel
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