Prepare for LVM based VCP

This patch adds metadata needed to setup partitions on
VCP with LVM.

The new param 'image_layout' is added to salt:control:size:<size_name>
This is metadata that describes partition layout of VCP.

For now VCP has predefined list of partitions see
https://gerrit.mcp.mirantis.com/#/c/30862/

image_layout defines sizes for each of partitions that should be
applied after VCP is provisioned. The resizing will be done by
growlvmp.py script placed on VCP
https://gerrit.mcp.mirantis.com/#/c/31052/

The default layout:

  image_layout:
    root:
      size: '30%VG'     # 30% of VG total size
    home:
      size: '1G'        # fixed size 1G
    var_log:
      size: '11%VG'     # 11% of VG total size
    var_log_audit:
      size: '5G'        # fixed size 5G
    var_tmp:
      size: '11%VG'     # 11% of VG total size
    tmp:
      size: '5G'        # fixed size 5G

Related-Prod: PROD-24537

Change-Id: I18205dfa8478be2ae092a87ced833c8ab0cc01ea
diff --git a/salt/control/placement/stacklight/small.yml b/salt/control/placement/stacklight/small.yml
index 9223340..4bfd44c 100644
--- a/salt/control/placement/stacklight/small.yml
+++ b/salt/control/placement/stacklight/small.yml
@@ -15,6 +15,27 @@
     stacklight_log_backend_image: ${_param:salt_control_xenial_image_backend}
     stacklight_monitor_backend_image: ${_param:salt_control_xenial_image_backend}
     stacklight_telemetry_backend_image: ${_param:salt_control_xenial_image_backend}
+    salt_control_cluster_node_cloud_init_stacklight_log:
+      user_data:
+        write_files:
+        - content: |
+            ${salt:control:size:stacklight.log:image_layout}
+          owner: root:root
+          path: /usr/share/growlvm/image-layout.yml
+    salt_control_cluster_node_cloud_init_stacklight_server:
+      user_data:
+        write_files:
+        - content: |
+            ${salt:control:size:stacklight.server:image_layout}
+          owner: root:root
+          path: /usr/share/growlvm/image-layout.yml
+    salt_control_cluster_node_cloud_init_stacklight_telemetry:
+      user_data:
+        write_files:
+        - content: |
+            ${salt:control:size:stacklight.telemetry:image_layout}
+          owner: root:root
+          path: /usr/share/growlvm/image-layout.yml
   salt:
     control:
       cluster:
@@ -26,51 +47,60 @@
               backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node04_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
+              cloud_init: ${_param:salt_control_cluster_node_cloud_init_stacklight_telemetry}
             mtr02:
               name: ${_param:stacklight_telemetry_node02_hostname}
               image: ${_param:salt_control_xenial_image}
               backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node05_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
+              cloud_init: ${_param:salt_control_cluster_node_cloud_init_stacklight_telemetry}
             mtr03:
               name: ${_param:stacklight_telemetry_node03_hostname}
               image: ${_param:salt_control_xenial_image}
               backend: ${_param:stacklight_telemetry_backend_image}
               provider: ${_param:infra_kvm_node06_hostname}.${_param:cluster_domain}
               size: stacklight.telemetry
+              cloud_init: ${_param:salt_control_cluster_node_cloud_init_stacklight_telemetry}
             log01:
               name: ${_param:stacklight_log_node01_hostname}
               image: ${_param:salt_control_xenial_image}
               backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node04_hostname}.${_param:cluster_domain}
               size: stacklight.log
+              cloud_init: ${_param:salt_control_cluster_node_cloud_init_stacklight_log}
             log02:
               name: ${_param:stacklight_log_node02_hostname}
               image: ${_param:salt_control_xenial_image}
               backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node05_hostname}.${_param:cluster_domain}
               size: stacklight.log
+              cloud_init: ${_param:salt_control_cluster_node_cloud_init_stacklight_log}
             log03:
               name: ${_param:stacklight_log_node03_hostname}
               image: ${_param:salt_control_xenial_image}
               backend: ${_param:stacklight_log_backend_image}
               provider: ${_param:infra_kvm_node06_hostname}.${_param:cluster_domain}
               size: stacklight.log
+              cloud_init: ${_param:salt_control_cluster_node_cloud_init_stacklight_log}
             mon01:
               name: ${_param:stacklight_monitor_node01_hostname}
               image: ${_param:salt_control_xenial_image}
               backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node04_hostname}.${_param:cluster_domain}
               size: stacklight.server
+              cloud_init: ${_param:salt_control_cluster_node_cloud_init_stacklight_server}
             mon02:
               name: ${_param:stacklight_monitor_node02_hostname}
               image: ${_param:salt_control_xenial_image}
               backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node05_hostname}.${_param:cluster_domain}
               size: stacklight.server
+              cloud_init: ${_param:salt_control_cluster_node_cloud_init_stacklight_server}
             mon03:
               name: ${_param:stacklight_monitor_node03_hostname}
               image: ${_param:salt_control_xenial_image}
               backend: ${_param:stacklight_monitor_backend_image}
               provider: ${_param:infra_kvm_node06_hostname}.${_param:cluster_domain}
               size: stacklight.server
+              cloud_init: ${_param:salt_control_cluster_node_cloud_init_stacklight_server}