Source kube_service tags from datadog-agent tagger

[sunhay]

Noticed that DataDog/datadog-agent#1147 was merged in, which provides kube_service tags via the main agent tagger so I threw this quickly together.

This means we can get rid of the kubernetes package and leave all tagging to the main agent 👌

Example container output:

 {
 	"type": "Docker",
 	"id": "ae1a330995759131547ed272aa2a6f2016bc39e5d1cfc377eea25e6c0242445e",
 	"cpuLimit": 100,
 	"state": 3,
 	"created": 1518044218,
 	"netRcvdPs": 1,
 	"netSentPs": 1,
 	"netRcvdBps": 518,
 	"netSentBps": 66,
 	"memRss": 9854976,
 	"memCache": 14700544,
 	"started": 1518044220,
 	"tags": [
 		"kube_service:kube-dns",
 		"kube_deployment:kube-dns",
 		"kube_namespace:kube-system",
 		"kube_container_name:sidecar",
 		"pod_name:kube-dns-86f6f55dd5-sdskb",
 		"kube_replica_set:kube-dns-86f6f55dd5",
 		"docker_image:gcr.io/google_containers/k8s-dns-sidecar-amd64:1.14.5",
 		"image_name:gcr.io/google_containers/k8s-dns-sidecar-amd64",
 		"image_tag:1.14.5",
 		"container_name:k8s_sidecar_kube-dns-86f6f55dd5-sdskb_kube-system_7c77b2a5-dea5-11e7-bdb9-080027e5e101_16",
 		"container_id:ae1a330995759131547ed272aa2a6f2016bc39e5d1cfc377eea25e6c0242445e"
 	]
 }

[conorbranagan]

Yahoo!