Fix task order;Add default hostname value

scripts/Update-OvfConfiguration.yml

@@ -50,8 +50,8 @@ PropertyCategories:
   - Key: guestinfo.hostname
     Type: string(1..15)
     Label: Hostname*
-    Description: '(max length: 15 characters)'
-    DefaultValue: ''
+    Description: ''
+    DefaultValue: 'META-NODE-{{ hostname.suffix }}'
     Configurations: '*'
     UserConfigurable: true
 
@@ -151,6 +151,9 @@ AdvancedOptions:
 
 ---
 Variables:
+- Name: hostname.suffix
+  Expression: |
+    (-join ((48..57) + (97..122) | Get-Random -Count 5 | % {[char]$_})).ToUpper()
 - Name: appliance.name
   Expression: |
     $Parameter['appliance.name']