cleanup HPAs and VPAs created by tortoise when deleting tortoises #96
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What this PR does / why we need it:
DeletionPolicy is the policy how the controller deletes associated HPA and VPAs when tortoise is removed.
If "DeleteAll", tortoise deletes all associated HPA and VPAs, created by tortoise. If the associated HPA is not created by tortoise,
which is associated by spec.targetRefs.horizontalPodAutoscalerName, tortoise never delete the HPA.
If "NoDelete", tortoise doesn't delete any associated HPA and VPAs.
"DeleteAll" is the default value.
Which issue(s) this PR fixes:
Fixes #58
Special notes for your reviewer: