Support enable/disable loadbalancer when creating cluster

Support enable/disable loadbalancer when creating cluster to
override the master_lb_enable config in cluster template.

Task: 40425
Story: 2007949

Change-Id: If548c7b7c95c3db191272a505ba3bff451076b13

magnum_ui/static/dashboard/container-infra/clusters/create/create.service.js

@@ -100,7 +100,8 @@
         cluster_template_id: model.cluster_template_id,
         keypair: model.keypair,
         floating_ip_enabled: model.floating_ip_enabled,
-        labels: requestLabels
+        labels: requestLabels,
+        master_lb_enabled: model.master_lb_enabled
       };
 
       // Optional request fields

magnum_ui/static/dashboard/container-infra/clusters/workflow/workflow.service.js

@@ -99,6 +99,7 @@
           },
           'max_node_count': { type: 'number' },
 
+          'master_lb_enabled': {type: 'boolean'},
           'create_network': { type: 'boolean' },
           'fixed_network': { type: 'string' },
           'floating_ip_enabled': { type: 'boolean' },
@@ -320,6 +321,11 @@
                       type: 'fieldset',
                       title: gettext('Network'),
                       items: [
+                        {
+                          key: 'master_lb_enabled',
+                          type: 'checkbox',
+                          title: gettext('Enable Load Balancer for Master Nodes')
+                        },
                         {
                           key: 'create_network',
                           title: gettext('Create New Network'),
@@ -477,6 +483,7 @@
           min_node_count: null,
           max_node_count: null,
 
+          master_lb_enabled: false,
           create_network: true,
           fixed_network: '',
           floating_ip_enabled: false,