The variable VersionInfo is supposed to be set by `go build -X ...` during link time but should not be modified at runtime.
This change ensures the underlying var is private and can only be accessed by a public getter.
* `upgrade apply` will try to make the locally configured and
actual version in the cluster match by appling necessary
upgrades.
* Skip image or kubernetes upgrades if one is already
in progress.
* Skip downgrades/equal-as-running versions
* Move NodeVersionResourceName constant from operators
to internal as its needed in the CLI.
Upgrade check is used to find updates for the current cluster.
Optionally the found upgrades can be persisted to the config
for consumption by the upgrade-execute cmd.
The old `upgrade execute` in this commit does not work with
the new `upgrade plan`.
The current versions are read from the cluster.
Supported versions are read from the cli and the versionsapi.
Adds a new config field MicroserviceVersion that will be used
by `upgrade execute` to update the service versions.
The field is optional until 2.7
A deprecation warning for the upgrade key is printed during
config validation.
Kubernetes versions now specify the patch version to make it
explicit for users if an upgrade changes the k8s version.
