tests: runtime: kubernetes: fix expected data output for incoming JSON log
-{"log":{"message_id":1, "word":"eagers"}, "stream":"stdout", "time":"2018-02-22T13:14:50.773975651Z", "message_id":1, "word":"eagers", "kubernetes":{"pod_name":"json-logs", "namespace_name":"default", "pod_id":"5ac76e2f-17d2-11e8-b34e-080027749cbc", "labels":{"run":"json-logs"}, "host":"minikube", "container_name":"json-logs", "docker_id":"c053db7370be9c33d64677f9759863d850ebe35104069bec241cd1bb4674bd19"}}
+{"log":"{\"message_id\": 1, \"word\": \"eagers\"}", "stream":"stdout", "time":"2018-02-22T13:14:50.773975651Z", "message_id":1, "word":"eagers", "kubernetes":{"pod_name":"json-logs", "namespace_name":"default", "pod_id":"5ac76e2f-17d2-11e8-b34e-080027749cbc", "labels":{"run":"json-logs"}, "host":"minikube", "container_name":"json-logs", "docker_id":"c053db7370be9c33d64677f9759863d850ebe35104069bec241cd1bb4674bd19"}}
