* Use value from ContextDetails to populate Namespace
This is a fix for: #372
This change uses the value from ContextDetails.Namespace to populate
KubernetesClientConfiguration.Namespace.
The issue is there's a Namespace property on both Context and ContextDetails
- The property on Context is used today
- The property on ContextDetails is not
- The property on ContextDetails maps to the actual yaml config
* Obsolete Context.Namespace
This property doesn't map to anything in the YAML and thus will never be
set. Other clients I checked (java, golang) don't look for a property
at this level.
I think this was likely a mistake, and it should be obsoleted because
it will never be populated.
Example:
```yaml
contexts:
- context:
cluster: ...
namespace: ... # this is ContextDetails.Namespace
user: ...
name: foo
```
```yaml
contexts:
- context:
cluster: ...
namespace: ...
user: ...
name: foo
namespace: ... # this is Context.Namespace
```
