[WIP] Micro Runtime (#947)

* Add Get() and GetOptions.

* Removed watcher. Outline of client. YAML templates

* Added default service and deployment templates and types

* Added API tests and cleaned up errors.

* Small refactoring. Template package is no more.

* Ripped out existing code in preparation to small rework

* Reshuffled the source code to make it organized better

* Create service and deployment in kubernetes runtime

* Major cleanup and refactoring of Kubernetes runtime

* Service now handles low level K8s API calls across both K8s deployment
an service API objects
* Runtime has a task queue that serves for queueing runtime action
requests
* General refactoring

* No need for Lock in k8s service

* Added kubernetes runtime env var to default deployment

* Enable running different versions of the same service

* Can't delete services through labels

* Proto cruft. Added runtime.CreateOptions implementation in proto

* Removed proxy service from default env variables

* Make service name mandatory param to Get method

* Get Delete changes from https://github.com/micro/go-micro/pull/945

* Replaced template files with global variables

* Validate service names before sending K8s API request

* Refactored Kubernetes API client. Fixed typos.

* Added client.Resource to make API resources more explicit in code

runtime/kubernetes/client/utils.go

@@ -5,9 +5,22 @@ import (
 	"encoding/pem"
 	"errors"
 	"fmt"
+	"io"
 	"io/ioutil"
+	"text/template"
 )
 
+// renderTemplateFile renders template file in path into writer w with supplied data
+func renderTemplate(text string, w io.Writer, data interface{}) error {
+	t := template.Must(template.New("kubernetes").Parse(text))
+
+	if err := t.Execute(w, data); err != nil {
+		return err
+	}
+
+	return nil
+}
+
 // COPIED FROM
 // https://github.com/kubernetes/kubernetes/blob/7a725418af4661067b56506faabc2d44c6d7703a/pkg/util/crypto/crypto.go