Merge branch 'es/fetch-show-failed-submodules-atend'

A fetch that is told to recursively fetch updates in submodules
inevitably produces reams of output, and it becomes hard to spot
error messages.  The command has been taught to enumerate
submodules that had errors at the end of the operation.

* es/fetch-show-failed-submodules-atend:
  fetch: emphasize failure during submodule fetch

diff --cc submodule.c
Simple merge