[PATCHv4 0/9] Expose submodule parallelism to the user

This replaces sb/submodule-parallel-update. It applies on top of d075d2604c0 (Merge branch 'rs/daemon-plug-child-leak' into sb/submodule-parallel-update, with additionally having merged submodule-parallel-fetch, which has applied "run-command: detect finished children by closed pipe rather than waitpid" on top of it. Alternatively pull from github/stefanbeller/git submodule-parallel-update

* This lets you configure submodule.fetchJobs instead of previously submodule.jobs
* no weird NONBLOCK thingies any more as that was handled by submodule-parallel-fetch
  (or the patch on top of that) 

Stefan Beller (9):
  run_processes_parallel: delimit intermixed task output
  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.jobs` 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 ++++-----
 run-command.c                   |   4 +
 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 +++++
 14 files changed, 417 insertions(+), 83 deletions(-)