[PATCH/RFC 0/3] Split fetch and merge logic

This series implements the split of the fetch and merge logic.

The first patch adds tests for the merge logic. It is very extensive and expensive (in time), so I just post this to show that (almost) nothing changes (although some part of if could be included). And the third patch shows what changes.

Santi Béjar (3):
      t/t5515-fetch-merge-logic.sh: Added tests for the merge login in git-fetch
      git-fetch: Split fetch and merge logic
      t/t5515: fixes for the separate fetch and merge logic