(#9241) Add destroy API request and model action

Without this patch we have no way to completely destroy
a server instance.  This patch adds a vm_destroy API request
and implements the destroy method on the server model.

The vSphere API requires the server to be in a poweredOff state.
The model action and the request do not verify this is the case
before issuing the command.

lib/fog/vsphere/compute.rb

@@ -18,6 +18,7 @@ module Fog
       request :vm_power_off
       request :vm_power_on
       request :vm_reboot
+      request :vm_destroy
       request :find_all_by_uuid
       request :find_all_by_instance_uuid
 

lib/fog/vsphere/models/compute/server.rb

@@ -70,6 +70,11 @@ module Fog
           connection.vm_reboot(:instance_uuid => instance_uuid, :force => params[:force])
         end
 
+        def destroy(params = {})
+          requires :instance_uuid
+          connection.vm_destroy(:instance_uuid => instance_uuid)
+        end
+
       end
 
     end

lib/fog/vsphere/requests/compute/vm_destroy.rb

@@ -0,0 +1,28 @@
+module Fog
+  module Compute
+    class Vsphere
+      class Real
+
+        def vm_destroy(params = {})
+          raise ArgumentError ":instance_uuid is a required parameter" unless params.has_key? :instance_uuid
+          vm = find_all_by_instance_uuid(params[:instance_uuid]).first
+          unless vm.kind_of? RbVmomi::VIM::VirtualMachine
+            raise Fog::Vsphere::Errors::NotFound, "Could not find VirtualMachine with instance uuid #{params[:instance_uuid]}"
+          end
+          task = vm.Destroy_Task
+          task.wait_for_completion
+          task.info.state
+        end
+
+      end
+
+      class Mock
+
+        def vm_destroy(params = {})
+          "success"
+        end
+
+      end
+    end
+  end
+end