Create a provider to use Azure Batch (#133)

* Started work on provider

* WIP Adding batch provider

* Working basic call into pool client. Need to parameterize the baseurl

* Fixed job creation by manipulating the content-type

* WIP Kicking off containers. Dirty

* [wip] More meat around scheduling simple containers.

* Working on basic task wrapper to co-schedule pods

* WIP on task wrapper

* WIP

* Working pod minimal wrapper for batch

* Integrate pod template code into provider

* Cleaning up

* Move to docker without gpu

* WIP batch integration

* partially working

* Working logs

* Tidy code

* WIP: Testing and readme

* Added readme and terraform deployment for GPU Azure Batch pool.

* Update to enable low priority nodes for gpu

* Fix log formatting bug. Return node logs when container not yet started

* Moved to golang v1.10

* Fix cri test

* Fix up minor docs Issue. Add provider to readme. Add var for vk image.

providers/cri/cri.go

@@ -616,7 +616,7 @@ func readLogFile(filename string, tail int) (string, error) {
 		lines = append(lines, scanner.Text())
 	}
 	if tail > 0 && tail < len(lines) {
-		lines = lines[len(lines)-tail : len(lines)]
+		lines = lines[len(lines)-tail:]
 	}
 	return strings.Join(lines, ""), nil
 }
@@ -636,7 +636,7 @@ func (p *CRIProvider) GetContainerLogs(namespace, podName, containerName string,
 	}
 	container := pod.containers[containerName]
 	if container == nil {
-		return "", fmt.Errorf("Cannot find container %s in pod %s namespace %s", containerName, pod, namespace)
+		return "", fmt.Errorf("Cannot find container %s in pod %s namespace %s", containerName, podName, namespace)
 	}
 
 	return readLogFile(container.LogPath, tail)