Arda Güçlü 832644f0b3 kubectl exec: return descriptive error message when multi resource passed ...

`kubectl exec` command supports getting files as inputs. However,
if the file contains multiple resources, it returns unclear error message;
`cannot attach to *v1.List: selector for *v1.List not implemented`.

Since `exec` command does not support multi resources, this PR
handles that and returns descriptive error message earlier.

2022-12-02 14:05:11 +03:00

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