Better name for reconcileAt annotation

[squaremo]

The annotation used by many GOTK types to trigger a reconciliation outside the specified schedule is called fluxcd.io/reconcileAt. I believe the idea was to imitate the annotation used in core Kubernetes, "restartedAt": https://github.com/kubernetes/kubectl/blob/master/pkg/polymorphichelpers/objectrestarter.go#L41. This works by changing the pod template of a workload, causing the controller to recreate all the pods. Any change will do there -- kubectl uses a timestamp, presumably so there's some indication what happened and when.

reconcileAt differs in this subtle but crucial regard: the name is not past tense, which indicates that it is imperative rather than informative -- "do this at", rather than "this was done at". A better name, suggested by Hidde, would be reconcile.fluxcd.io/requestedAt, which has the right connotation, and leaves room for other performatives like reconcile.fluxcd.io/forcedAt.

[hiddeco]

A better name, suggested by Hidde, would be reconcile.fluxcd.io/requestedAt, which has the right connotation, and leaves room for other performatives like reconcile.fluxcd.io/forcedAt.

Another discussion related to this is #103, which would then become reconcile.fluxcd.io/testedAt.

[squaremo]

Implementation of backward-compatible annotation scheme: fluxcd/pkg#37