add cinder max attached volumes (#5089)

contrib/terraform/openstack/README.md

@@ -415,6 +415,11 @@ kube_network_plugin: flannel
 # For Container Linux by CoreOS:
 resolvconf_mode: host_resolvconf
 ```
+- Set max amount of attached cinder volume per host (default 256)
+```
+node_volume_attach_limit: 26
+```
+
 
 ### Deploy Kubernetes
 

roles/kubernetes/node/templates/cloud-configs/openstack-cloud-config.j2

@@ -27,6 +27,9 @@ bs-version={{ openstack_blockstorage_version }}
 {% if openstack_blockstorage_ignore_volume_az is defined and openstack_blockstorage_ignore_volume_az|bool %}
 ignore-volume-az={{ openstack_blockstorage_ignore_volume_az }}
 {% endif %}
+{% if node_volume_attach_limit is defined and node_volume_attach_limit != "" %}
+node-volume-attach-limit="{{ node_volume_attach_limit }}"
+{% endif %}
 
 {% if openstack_lbaas_enabled and openstack_lbaas_subnet_id is defined %}
 [LoadBalancer]