Add IronicDhcpv6StatefulAddressCount parameter

Support fo additional ip address allocations when using
dhcpv6 stateful was added in https://review.opendev.org/700002
and backported to stein in https://review.opendev.org/717205.

This change adds support in the tripleo-heat-templates to
configurie the amount of addresses to allocate.

Closes-Bug: #1872998
Depends-On: https://review.opendev.org/720204
Depends-On: https://review.opendev.org/720441
Change-Id: I675aa165c8580dc1416dfc87613e88940a88491f
(cherry picked from commit 436ebad75d)

deployment/ironic/ironic-conductor-container-puppet.yaml

@@ -236,6 +236,16 @@ parameters:
     default: 4
     description: The IP version that will be used for PXE booting.
     type: string
+  IronicDhcpv6StatefulAddressCount:
+    default: 4
+    description: Number of IPv6 addresses to allocate for ports created for
+                 provisioning, cleaning, rescue or inspection on DHCPv6-stateful
+                 networks. Different stages of the chain-loading process will
+                 request addresses with different CLID/IAID. Due to non-
+                 identical identifiers multiple addresses must be reserved for
+                 the host to ensure each step of the boot process can
+                 successfully lease addresses.
+    type: string
 
 conditions:
   default_deploy_interface_unset: {equals : [{get_param: IronicDefaultDeployInterface}, '']}
@@ -404,6 +414,7 @@ outputs:
             ironic::neutron::project_name: 'service'
             ironic::neutron::user_domain_name: 'Default'
             ironic::neutron::project_domain_name: 'Default'
+            ironic::neutron::dhcpv6_stateful_address_count: {get_param: IronicDhcpv6StatefulAddressCount}
             ironic::service_catalog::auth_url: {get_param: [EndpointMap, KeystoneInternal, uri_no_suffix]}
             ironic::service_catalog::username: 'ironic'
             ironic::service_catalog::password: {get_param: IronicPassword}

releasenotes/notes/ironic-dhcpv6-stateful-address-count-ca568a32f07aec53.yaml

@@ -0,0 +1,7 @@
+---
+features:
+  - |
+    For baremetal operations on DHCPv6-stateful networks multiple IPv6 addresses
+    can now be allocated for neutron ports created for provisioning, cleaning,
+    rescue or inspection. The new parameter ``IronicDhcpv6StatefulAddressCount``
+    controls the number of addresses to allocate.