Add option for overlayfs "disable openfile inode check"

[github at samba.org]

New comment by douglasbagnall on Samba Github repository

https://github.com/samba-team/samba/pull/44#issuecomment-451055187
Comment:
This proposal was fairly thoroughly rejected on the mailing list:
https://lists.samba.org/archive/samba-technical/2015-December/111125.html

Can someone with closing powers close this pull request?

Sorry @RG72 if our technical communication failures left you wondering for three years.