[Autoscaler] Making bootstrap config part of the node provider interface (#9443)

* supporting custom bootstrap config for external node providers

* bootstrap config

* renamed config to cluster_config

* lint

* remove 2 args from importer

* complete move of bootstrap to node_provider

* renamed provider_cls

* move imports outside functions

* lint

* Update python/ray/autoscaler/node_provider.py

Co-authored-by: Eric Liang <ekhliang@gmail.com>

* final fixes

* keeping lines to reduce diff

* lint

* lamba config

* filling in -> adding for lint

Co-authored-by: Ameer Haj Ali <ameerhajali@Ameers-MacBook-Pro.local>
Co-authored-by: Eric Liang <ekhliang@gmail.com>

python/ray/autoscaler/kubernetes/node_provider.py

@@ -2,6 +2,7 @@ import logging
 
 from ray.autoscaler.kubernetes import core_api, log_prefix
 from ray.autoscaler.node_provider import NodeProvider
+from ray.autoscaler.kubernetes.config import bootstrap_kubernetes
 from ray.autoscaler.tags import TAG_RAY_CLUSTER_NAME
 from ray.autoscaler.updater import KubernetesCommandRunner
 
@@ -97,3 +98,7 @@ class KubernetesNodeProvider(NodeProvider):
                            docker_config=None):
         return KubernetesCommandRunner(log_prefix, self.namespace, node_id,
                                        auth_config, process_runner)
+
+    @staticmethod
+    def bootstrap_config(cluster_config):
+        return bootstrap_kubernetes(cluster_config)