Error when namespace exists

[scottd018]

We shouldn't error out on an existing namespace. Instead, we should:

1. Skip namespace creation or update if the ownerref does not match the expected value

-OR-

2. Continue with appropriate updates when the ownerref does match the expected value

2021-02-03T22:10:44.098Z        ERROR   controller-runtime.controller   Reconciler error        {"controller": "tanzunamespace", "request": "/namespace-30", "error": "namespaces \"namespace-30\" already exists"}
github.com/go-logr/zapr.(*zapLogger).Error
        /Users/sdustin/go/pkg/mod/github.com/go-logr/zapr@v0.1.0/zapr.go:128
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).reconcileHandler
        /Users/sdustin/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.5.0/pkg/internal/controller/controller.go:258
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).processNextWorkItem
        /Users/sdustin/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.5.0/pkg/internal/controller/controller.go:232
sigs.k8s.io/controller-runtime/pkg/internal/controller.(*Controller).worker
        /Users/sdustin/go/pkg/mod/sigs.k8s.io/controller-runtime@v0.5.0/pkg/internal/controller/controller.go:211
k8s.io/apimachinery/pkg/util/wait.JitterUntil.func1
        /Users/sdustin/go/pkg/mod/k8s.io/apimachinery@v0.17.2/pkg/util/wait/wait.go:152
k8s.io/apimachinery/pkg/util/wait.JitterUntil
        /Users/sdustin/go/pkg/mod/k8s.io/apimachinery@v0.17.2/pkg/util/wait/wait.go:153
k8s.io/apimachinery/pkg/util/wait.Until
        /Users/sdustin/go/pkg/mod/k8s.io/apimachinery@v0.17.2/pkg/util/wait/wait.go:88