[WIP] Set EMS status when during orchestrate_destroy

[agrare]

Set the ems status to deleting while the workers are shutting down.
This can be used for display as well as preventing the user from
accidentally re-enabling an EMS which is being deleted.

Depends: ManageIQ/manageiq-schema#140

[agrare]

I'd like to add a task to track the destroy that can be seen by users, probably need to change the args to allow a userid to be passed in from the UI.

[miq-bot]

This pull request is not mergeable. Please rebase and repush.

[chessbyte]

@agrare Please rebase and re-push

[miq-bot]

Checked commit agrare@b1eba2c with ruby 2.3.3, rubocop 0.52.0, haml-lint 0.20.0, and yamllint 1.10.0
1 file checked, 0 offenses detected
Everything looks fine. 👍

[agrare]

Rebased but the need for this might be negated by #16755 since it looks like we don't wait for the workers to shutdown anymore. @jameswnl can you confirm?

[jameswnl]

@agrare we are killing the workers right now. The killing does have a sleep loop to make sure it's done, albeit the wait shouldn't be apparent to user.

However, it seems it still can take some time to finish depending on how much associated resources are being cleaned up along the provider destroy.

[agrare]

👍 thanks @jameswnl

[agrare]

Going to close this for now since it isn't getting any traction. If we find we need this in the future I will re-open it.