slapos format: fix use_unique_local_address_block feature, and put default to false in configure_local.

Correct fix.

alter_user is true again by default.
This reverts commit 266d0869.
This code has nothing to do with partition chown.

slapos.grid: Adapt retention_delay implementation to support retention_delay being specified in SLA.

This reverts commit 0387648c.

To be able to wrap on all text editors.

Mostly informational, it is more improtant to have a functional slapgrid.
Also: remove trailing spaces.

Also remove trailing whitespaces.

Note: To finish the refactor, a lot of work is still needed, but not mandatory for multimaster feature.