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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