Merge changes from topics "envsetup_cleanup_2", "fix_get_build_var",...

Merge changes from topics "envsetup_cleanup_2", "fix_get_build_var", "module_info_functions" into main

* changes:
  Delete envsetup.sh functions that haven't worked for a long time.
  Make get_build_var and get_abs_build_var into scripts.
  More moving shell functions in envsetup.sh to standalone scripts.
  Remove apparently unused 'pez' function from envsetup.sh
  build/make side of move the module-info.json commands into standalone scripts.
  Remove the "provision" shell function from envsetup.sh