ironlib is able to detect ineffective wipes

[turegano-equinix]

What does this PR do

Disks lie about supporting standard commands and/or successful completion of those commands, so we need to “trust but verify”. We have definitely seen this before, most recently with some micron nvme disks that respond successfully to TRIM commands but do not actually wipe the data

How can this change be tested by a PR reviewer?

Added in examples/diskwipe/main.go

Description for changelog/release notes

ironlib is able to detect ineffective wipes

[mmlb]

Would love to see a test for this. Both postive and negative tests. Negative could be create a ~15KB empty file, and run check func after this wipe. It should error out.

Then for the postive case: wipe the same file (truncate to 0b then seek to a position is quick and easy, let the kernel figure it out :D) and run check again it should pass.

Maybe write the file full of random data and run check again to make sure it still comes back with an error? I don't really think this last one is necessary though.

[mmlb]

lgtm2