Rename Event.Status to Event.Condition to match v1beta3 agreement

Question - should this be a phase?  Seems like no, since phase implies
defined lifecycle and this field is explicitly not defined.

@lavalamp

Part of #1519 to allow roundtripping to v1beta3
Does that actually work?  I tried it, but I may have done the wrong thing (I tried to use PodStatus / PodCondition and those failed)

----- Original Message -----
> > @@ -507,5 +507,35 @@ func init() {
> >  			out.FieldPath = in.FieldPath
> >  			return nil
> >  		},
> > +
> > +		// Event Status -> Condition
> 
> Instead of conv function consider:
> 
> ```
> newer.Scheme.AddStructFieldConversion(string(""), "Status", string(""),
> "Condition")
> newer.Scheme.AddStructFieldConversion(string(""), "Condition", string(""),
> "Status")
> ```
> 
> I'm not 100% sure it's better. I have a change in the pipeline that will
> allow asserting parent type to avoid accidentally making this transformation
> to another type.
> 
> ---
> Reply to this email directly or view it on GitHub:
> https://github.com/GoogleCloudPlatform/kubernetes/pull/2911/files#r21855738