[PATCHv7 0/8] Expose submodule parallelism to the user

This is a resend of sb/submodule-parallel-update and is available at github[1] as well. It applies on top of sb/submodule-parallel-fetch

What does it do?
---
This series should finish the on going efforts of parallelizing
submodule network traffic. The patches contain tests for
  clone
  fetch
  submodule update
to use the actual parallelism both via command line as well as a
configured option. I decided to go with "submodule.fetchJobs" for
all three for now.

What changed to v5,6? --- No major changes, I just made it compile again as the order of parameters to the parallel processing engine changed.

Thanks, Stefan

[1] https://github.com/stefanbeller/git/tree/submodule-parallel-update-v7

Stefan Beller (8):
  submodule-config: keep update strategy around
  submodule-config: drop check against NULL
  submodule-config: remove name_and_item_from_var
  submodule-config: introduce parse_generic_submodule_config
  fetching submodules: respect `submodule.fetchJobs` config option
  git submodule update: have a dedicated helper for cloning
  submodule update: expose parallelism to the user
  clone: allow an explicit argument for parallel submodule clones

 Documentation/config.txt        |   7 ++
 Documentation/git-clone.txt     |   6 +-
 Documentation/git-submodule.txt |   7 +-
 builtin/clone.c                 |  19 +++-
 builtin/fetch.c                 |   2 +-
 builtin/submodule--helper.c     | 239 ++++++++++++++++++++++++++++++++++++++++
 git-submodule.sh                |  54 ++++-----
 submodule-config.c              | 109 +++++++++++-------
 submodule-config.h              |   3 +
 submodule.c                     |   5 +
 t/t5526-fetch-submodules.sh     |  14 +++
 t/t7400-submodule-basic.sh      |   4 +-
 t/t7406-submodule-update.sh     |  27 +++++
 13 files changed, 413 insertions(+), 83 deletions(-)