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.

vkubelet/provider.go

@@ -3,6 +3,7 @@ package vkubelet
 import (
 	"github.com/virtual-kubelet/virtual-kubelet/providers/aws"
 	"github.com/virtual-kubelet/virtual-kubelet/providers/azure"
+	"github.com/virtual-kubelet/virtual-kubelet/providers/azurebatch"
 	"github.com/virtual-kubelet/virtual-kubelet/providers/cri"
 	"github.com/virtual-kubelet/virtual-kubelet/providers/hypersh"
 	"github.com/virtual-kubelet/virtual-kubelet/providers/web"
@@ -14,6 +15,7 @@ var _ Provider = (*aws.FargateProvider)(nil)
 var _ Provider = (*azure.ACIProvider)(nil)
 var _ Provider = (*hypersh.HyperProvider)(nil)
 var _ Provider = (*web.BrokerProvider)(nil)
+var _ Provider = (*azurebatch.Provider)(nil)
 var _ Provider = (*cri.CRIProvider)(nil)
 
 // Provider contains the methods required to implement a virtual-kubelet provider.