(#9241) Add find_template_by_instance_uuid request

Without this patch we did not have a convenient way to find
a template by instance UUID.  We could only find virtual
machines by instance UUID, which may or may not be a template.

This patch adds a specific request to obtain the VMware managed
object instance of of a specific template.  This is necessary
plumbing for the clone request.

lib/fog/vsphere/compute.rb

@@ -21,6 +21,7 @@ module Fog
       request :vm_destroy
       request :find_all_by_uuid
       request :find_all_by_instance_uuid
+      request :find_template_by_instance_uuid
 
       class Mock
 

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

@@ -0,0 +1,27 @@
+module Fog
+  module Compute
+    class Vsphere
+      class Real
+
+        def find_template_by_instance_uuid(instance_uuid)
+          vm = list_virtual_machines.detect(lambda { raise Fog::Vsphere::Errors::NotFound }) do |vm|
+            vm.config.instanceUuid == instance_uuid
+          end
+          unless vm.config.template
+            raise Fog::Vsphere::Errors::NotFound, "VM with Instance UUID #{instance_uuid} is not a template."
+          end
+          vm
+        end
+
+      end
+
+      class Mock
+
+        def find_template_by_instance_uuid(instance_uuid)
+          Fog::Mock.not_implmented
+        end
+
+      end
+    end
+  end
+end