Fix stuttering output when supplying multiple files as input

[brendanjryan]

Fixes a logging control flow bug which would result in multiple "output sets" being produced when supplying multiple input files. For example, an invocation with three files and -o json would produce three distinct arrays of output, instead of a single array.

Before:

⇒  ./bin/kubeval -o json fixtures/valid.yaml fixtures/invalid.yaml
[
        {
                "filename": "fixtures/valid.yaml",
                "kind": "ReplicationController",
                "status": "valid",
                "errors": []
        }
]
[
        {
                "filename": "fixtures/invalid.yaml",
                "kind": "ReplicationController",
                "status": "invalid",
                "errors": [
                        "spec.replicas: Invalid type. Expected: [integer,null], given: string"
                ]
        }
]

After:

⇒  bin/kubeval -o json fixtures/valid.yaml fixtures/valid.yaml
[
        {
                "filename": "fixtures/valid.yaml",
                "kind": "ReplicationController",
                "status": "valid",
                "errors": []
        },
        {
                "filename": "fixtures/valid.yaml",
                "kind": "ReplicationController",
                "status": "valid",
                "errors": []
        }
]

⇒  ./bin/kubeval -o json fixtures/valid.yaml fixtures/invalid.yaml fixtures/multi_valid.yaml 
[
        {
                "filename": "fixtures/valid.yaml",
                "kind": "ReplicationController",
                "status": "valid",
                "errors": []
        },
        {
                "filename": "fixtures/invalid.yaml",
                "kind": "ReplicationController",
                "status": "invalid",
                "errors": [
                        "spec.replicas: Invalid type. Expected: [integer,null], given: string"
                ]
        },
        {
                "filename": "fixtures/multi_valid.yaml",
                "kind": "Service",
                "status": "valid",
                "errors": []
        },
        {
                "filename": "fixtures/multi_valid.yaml",
                "kind": "ReplicationController",
                "status": "valid",
                "errors": []
        },
        {
                "filename": "fixtures/multi_valid.yaml",
                "kind": "Service",
                "status": "valid",
                "errors": []
        },
        {
                "filename": "fixtures/multi_valid.yaml",
                "kind": "ReplicationController",
                "status": "valid",
                "errors": []
        },
        {
                "filename": "fixtures/multi_valid.yaml",
                "kind": "Service",
                "status": "valid",
                "errors": []
        },
        {
                "filename": "fixtures/multi_valid.yaml",
                "kind": "ReplicationController",
                "status": "valid",
                "errors": []
        },
        {
                "filename": "fixtures/multi_valid.yaml",
                "kind": "",
                "status": "skipped",
                "errors": []
        },
        {
                "filename": "fixtures/multi_valid.yaml",
                "kind": "",
                "status": "skipped",
                "errors": []
        }
]

[brendanjryan]

cc @garethr

[garethr]

Thanks for catching, and the fix.