[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/runtime.go

@@ -12,17 +12,19 @@ var (
 type Runtime interface {
 	// Init initializes runtime
 	Init(...Option) error
-	// Registers a service
+	// Create registers a service
 	Create(*Service, ...CreateOption) error
-	// Remove a service
-	Delete(*Service) error
+	// Get returns service or fails with error
+	Get(string, ...GetOption) ([]*Service, error)
 	// Update the service in place
 	Update(*Service) error
+	// Remove a service
+	Delete(*Service) error
 	// List the managed services
 	List() ([]*Service, error)
-	// starts the runtime
+	// Start starts the runtime
 	Start() error
-	// Shutdown the runtime
+	// Stop shuts down the runtime
 	Stop() error
 }