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/azurebatch/deployment/variables.tf

@@ -0,0 +1,23 @@
+variable "client_id" {
+  type        = "string"
+  description = "Client ID"
+}
+
+variable "client_secret" {
+  type        = "string"
+  description = "Client secret."
+}
+
+variable "resource_group_name" {
+  description = "Resource group name"
+  type        = "string"
+}
+
+variable "resource_group_location" {
+  description = "Resource group location"
+  type        = "string"
+}
+
+variable "virtualkubelet_docker_image" {
+  type = "string"
+}