Creating new module function salt.modules.file.list_backups_dir
groupby belongs to itertools
Merge branch 'add-file-list_backups_dir-func' of https://github.com/nmadhok/salt into nmadhok-add-file-list_backups_dir-func
lint cleanup
Merge pull request #15806 from thatch45/nmadhok-add-file-list_backups_dir-func

Merge #15762