[PATCH v2 0/2] isolate privatens way

[Zorro Lang <zlang@xxxxxxxxxx>]

This patch is a workaround for 2 targets:
1) Avoid the regressions of lastest xfstests release.
2) Give us more time to improve the "privatens" method.

And compare with revert that commit directly, this patch trys to
give "privatens" method a chance to be enabled and tested (by
export TRY_PRIVATENS=yes).

V2 uses a separate patch to remove the deprecation.

Thanks,  
Zorro