Option to disable free space checks

[laurivosandi]

With thin provisioning it's quite easy to bump into resource exhausted errors.

I ended up disabling some checks

https://git.k-space.ee/k-space/rawfile-localpv/commit/17f653b15ff1edd43473f8c4f3adba33c3703d1a
https://git.k-space.ee/k-space/rawfile-localpv/commit/9c4cda7c0a33b7e1d65cda67608a09f6fe1fae36

Please make this configurable upstream

[semekh]

Those checks are in place to prevent over-provisioning. Are you suggesting that is should be allowed to do so?

[laurivosandi]

I am suggesting making it configurable. I do want over-provisioning