Lands rapid7#4938, updates the spec template to match new tests

Author: HD Moore

tools/missing-payload-tests.rb

@@ -61,7 +61,7 @@
 
          $stderr.puts
          $stderr.puts "  context '#{reference_name}' do\n" \
-                      "    it_should_behave_like 'payload can be instantiated',\n" \
+                      "    it_should_behave_like 'payload cached size is consistent',\n" \
                       "                          ancestor_reference_names: ["
 
          ancestor_reference_names = options[:ancestor_reference_names]
@@ -74,6 +74,7 @@
          end
 
          $stderr.puts "                          ],\n" \
+                      "                          dynamic_size: false,\n" \
                       "                          modules_pathname: modules_pathname,\n" \
                       "                          reference_name: '#{reference_name}'\n" \
                       "  end"