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.

  Revert the implementation for now as it still not decided
  if we want this as part of the API or not.

Revert "Fix commit on getComputerConnectionParameterList"

This reverts commit 9d25d12b.

Revert "Delete Computer_getConnectionParameterList from slapos_cloud"

This reverts commit 75c5217f.

Revert "Add unit test for getComputerConnectionParameterList"

This reverts commit 4691a18b.

Revert "Computer: Get connection parameters for aggregated hosting subscriptions"

This reverts commit 995bea7a.

Revert "Hosting Subscription: Add aggregate base category"

This reverts commit b3e8a8ab.

Revert "Computer request software instance workflow"

This reverts commit 1350e574.