Merge branch 'jt/upload-pack-v2-fix-shallow'

"git fetch" over protocol v2 into a shallow repository failed to
fetch full history behind a new tip of history that was diverged
before the cut-off point of the history that was previously fetched
shallowly.

* jt/upload-pack-v2-fix-shallow:
  upload-pack: clear flags before each v2 request
  upload-pack: make want_obj not global
  upload-pack: make have_obj not global

diff --cc t/t5702-protocol-v2.sh
Simple merge

diff --cc upload-pack.c
Simple merge