keep pause=true when rollout CR is deleted #272
Description
currently, when rollout CR is deleted, rollout controller will recover the deployment to its original spec, which also including the spec.paused field. However this may result in deployment rolling release, which is unexpected for many users.
It is desirable to have the ability to keep the deployment as is when rollout is deleted, that is
- still recover the deployment strategy to its original setting but leave the pause remain to be true.
- add a featuregate to switch the behavior when rollout is deleted.