Nexus Operator as a Cluster Scoped Operator

[ricardozanini]

Is your feature request related to a problem? Please describe.
On version 0.3.0, Nexus Operator is a namespaced operator, meaning that it needs to be installed on every namespace in a cluster or in the same namespace where the Nexus CR is deployed. We would leverage from the new SDK upgrade if Nexus Operator could be installed in one namespace, let's say operators and would watch every namespace for Nexus CRs.

Besides the new SDK format we could also create SCCs automatically on OpenShift, since it's a cluster scope resource (see #51).

Describe the solution you'd like
The operator to be installed in one single namespace and watch all namespaces in a given cluster.

Describe alternatives you've considered
Right now the operands must coexist in the same namespace as the operator.