Add vnet join permission for azure

Author: dlom

install/0000_30_machine-api-operator_00_credentials-request.yaml

@@ -115,6 +115,7 @@ spec:
     - Microsoft.Network/routeTables/read
     - Microsoft.Network/virtualNetworks/delete
     - Microsoft.Network/virtualNetworks/read
+    - Microsoft.Network/virtualNetworks/join/action
     - Microsoft.Network/virtualNetworks/subnets/join/action
     - Microsoft.Network/virtualNetworks/subnets/read
     - Microsoft.Resources/subscriptions/resourceGroups/read