Merge branch 'ab/retire-parse-remote'

"git-parse-remote" shell script library outlived its usefulness.

* ab/retire-parse-remote:
  submodule: fix fetch_in_submodule logic
  parse-remote: remove this now-unused library
  submodule: remove sh function in favor of helper
  submodule: use "fetch" logic instead of custom remote discovery

diff --cc .gitignore
Simple merge

diff --cc Makefile
Simple merge

diff --cc command-list.txt
Simple merge