Rename security.knative.dev -> policy.run.google.cloud.com

[yolocs]

Fixes #726

Proposed Changes

• API group name and where it's used
• Go package name
• Installation namespace and labels
• (Piggybacking) Allow controller service account to update k8s Event

Release Note

Rename security.knative.dev -> policy.run.google.cloud.com

[knative-prow-robot]

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[yolocs]

FYI @Harwayne

[knative-metrics-robot]

The following is the coverage report on the affected files.
Say /test pull-google-knative-gcp-go-coverage to re-run this coverage report

File	Old Coverage	New Coverage	Delta
pkg/apis/policy/v1alpha1/common_defaults.go	Do not exist	100.0%
pkg/apis/policy/v1alpha1/common_lifecycle.go	Do not exist	81.2%
pkg/apis/policy/v1alpha1/common_types.go	Do not exist	88.9%
pkg/apis/policy/v1alpha1/common_validation.go	Do not exist	95.7%
pkg/apis/policy/v1alpha1/eventpolicy_defaults.go	Do not exist	100.0%
pkg/apis/policy/v1alpha1/eventpolicy_types.go	Do not exist	50.0%
pkg/apis/policy/v1alpha1/eventpolicy_validation.go	Do not exist	100.0%
pkg/apis/policy/v1alpha1/eventpolicybinding_defaults.go	Do not exist	100.0%
pkg/apis/policy/v1alpha1/eventpolicybinding_types.go	Do not exist	75.0%
pkg/apis/policy/v1alpha1/eventpolicybinding_validation.go	Do not exist	91.7%
pkg/apis/policy/v1alpha1/httppolicy_defaults.go	Do not exist	100.0%
pkg/apis/policy/v1alpha1/httppolicy_types.go	Do not exist	50.0%
pkg/apis/policy/v1alpha1/httppolicy_validation.go	Do not exist	100.0%
pkg/apis/policy/v1alpha1/httppolicybinding_defaults.go	Do not exist	100.0%
pkg/apis/policy/v1alpha1/httppolicybinding_types.go	Do not exist	75.0%
pkg/apis/policy/v1alpha1/httppolicybinding_validation.go	Do not exist	91.7%
pkg/apis/policy/v1alpha1/register.go	Do not exist	100.0%
pkg/reconciler/policy/istio/eventpolicybinding/controller.go	Do not exist	100.0%
pkg/reconciler/policy/istio/eventpolicybinding/eventpolicybinding.go	Do not exist	90.7%
pkg/reconciler/policy/istio/eventpolicybinding/resources/httppolicy.go	Do not exist	100.0%
pkg/reconciler/policy/istio/eventpolicybinding/resources/httppolicybinding.go	Do not exist	100.0%
pkg/reconciler/policy/istio/httppolicybinding/controller.go	Do not exist	100.0%
pkg/reconciler/policy/istio/httppolicybinding/httppolicybinding.go	Do not exist	84.6%
pkg/reconciler/policy/istio/httppolicybinding/resources/authorization_policy.go	Do not exist	100.0%
pkg/reconciler/policy/istio/httppolicybinding/resources/request_authentication.go	Do not exist	100.0%
pkg/reconciler/policy/subject_resolver.go	Do not exist	89.7%

[Harwayne]

/lgtm