ovirt-networking: using profiles

This patch fixes some issues in oVirt vm provision network tab.
1. Changing the 'vLan' label to 'Network'
2. Displaying the vnic profiles instead of the host/hosts networks (only
profiles configured in the cluster).
3. Using OvirtSDK4.

Changes relevant to version 4 only.

app/models/miq_provision_virt_workflow.rb

@@ -187,6 +187,14 @@ def update_field_read_only(options = {})
 
   def allowed_hosts_obj(options = {})
     all_hosts = super
+    filter_allowed_hosts(all_hosts)
+  end
+
+  def filter_allowed_hosts(all_hosts)
+    filter_hosts_by_vlan_name(all_hosts)
+  end
+
+  def filter_hosts_by_vlan_name(all_hosts)
     vlan_name = get_value(@values[:vlan])
     return all_hosts unless vlan_name
 
@@ -225,15 +233,23 @@ def available_vlans_and_hosts(options = {})
       rails_logger('allowed_vlans', 0)
       # TODO: Use Active Record to preload this data?
       MiqPreloader.preload(hosts, :switches => :lans)
-      hosts.each do |h|
-        h.lans.each { |l| vlans[l.name] = l.name unless l.switch.shared? }
-      end
+      load_allowed_vlans(hosts, vlans)
       rails_logger('allowed_vlans', 1)
     end
 
     return vlans, hosts
   end
 
+  def load_allowed_vlans(hosts, vlans)
+    load_hosts_vlans(hosts, vlans)
+  end
+
+  def load_hosts_vlans(hosts, vlans)
+    hosts.each do |h|
+      h.lans.each { |l| vlans[l.name] = l.name unless l.switch.shared? }
+    end
+  end
+
   def filter_by_tags(target, options)
     opt_filters = options[:tag_filters]
     return target if opt_filters.blank?

product/dialogs/miq_dialogs/miq_provision_redhat_dialogs_template.yaml

@@ -418,8 +418,8 @@
               :dvs: true
               :vlans: true
             :method: :allowed_vlans
-          :description: vLan
-          :required: true
+          :description: Network
+          :required: false
           :display: :edit
           :data_type: :string
         :mac_address: