Ensure that unbonding-delegations/redelegations for removed validators are still slashable

[cwgoes]

Presently, if a validator is removed from the store, we won't slash any associated unbonding delegations. I think this is incorrect, since a validator will be removed when the last delegate starts unbonding from it - but we want the unbonding delegations to be slashable for an unbonding period even if the validator no longer has any power.

[rigelrozanski]

Yup - if a validator is removed we still need to slash for those unbonding/redelgation

[ebuchman]

Should this be in current iteration? I think it's state-machine breaking no?

[cwgoes]

Should this be in current iteration? I think it's state-machine breaking no?

It is - a bug, not a new feature, but we could delay if we want to avoid any state-machine breaking changes.

[ebuchman]

Ok, removed from current iteration. Let's try to keep this iteration to non-breaking fixes so we can push them out to gaia-7000. We'll pick up the breaking ones for the next iteration