Code simplification and clarification.
* mh/fetch-filter-refs:
fetch-pack: eliminate spurious error messages
cmd_fetch_pack(): simplify computation of return value
fetch-pack: report missing refs even if no existing refs were received
cmd_fetch_pack(): return early if finish_connect() fails
filter_refs(): simplify logic
filter_refs(): build refs list as we go
filter_refs(): delete matched refs from sought list
fetch_pack(): update sought->nr to reflect number of unique entries
filter_refs(): do not check the same sought_pos twice
Change fetch_pack() and friends to take string_list arguments
fetch_pack(): reindent function decl and defn
Rename static function fetch_pack() to http_fetch_pack()
t5500: add tests of fetch-pack --all --depth=N $URL $REF
t5500: add tests of error output for missing refs
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