We add a new label to our constants, called
`cassandra.rook.io/decommissioned`. When it is present on a
member's ClusterIP Service with the value "false", it expresses
the intent of the controller to decommission the member. When it is
present with the value "true", it means that decommission has completed.
Signed-off-by: Yannis Zarkadas <yanniszarkadas@gmail.com>
Control logic for the cassandra controller.
The controller exists in a separate StatefulSet, watches
Kubernetes Objects for changes and acts on those changes to
achieve the desired state.
Signed-off-by: Yannis Zarkadas <yanniszarkadas@gmail.com>