Merge branch 'pb/pull-rebase-recurse-submodules'

"git pull --rebase --recurse-submodules" checked for local changes
in a wrong range and failed to run correctly when it should.

* pb/pull-rebase-recurse-submodules:
  pull: check for local submodule modifications with the right range
  t5572: describe '--rebase' tests a little more
  t5572: add notes on a peculiar test
  pull --rebase: compute rebase arguments in separate function

diff --cc builtin/pull.c
Simple merge