Merge branch 'jt/avoid-lazy-fetching-upon-have-check' into master

Fetching from a lazily cloned repository resulted at the server
side in attempts to lazy fetch objects that the client side has,
many of which will not be available from the third-party anyway.

* jt/avoid-lazy-fetching-upon-have-check:
  upload-pack: do not lazy-fetch "have" objects