Disable puml metadata output (#1359)

Puml metadata output causes frequent, unnecessary changes to generated puml images in the test sites. Let's disable this as such, reducing the frequency of such changes. However, changes due to differences in environments, such as a different graphviz version, may still cause such changes.
MarkBind · Sep 20, 2020 · c4664f2 · c4664f2
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diff --git a/...ges/cli/test/functional/test_site/expected/9c9e77fc0a983cb6b592e65733787bec.png b/...ges/cli/test/functional/test_site/expected/9c9e77fc0a983cb6b592e65733787bec.png
diff --git a/packages/cli/test/functional/test_site/expected/diagrams/activity.png b/packages/cli/test/functional/test_site/expected/diagrams/activity.png
diff --git a/packages/cli/test/functional/test_site/expected/diagrams/class.png b/packages/cli/test/functional/test_site/expected/diagrams/class.png
diff --git a/packages/cli/test/functional/test_site/expected/diagrams/component.png b/packages/cli/test/functional/test_site/expected/diagrams/component.png
diff --git a/packages/cli/test/functional/test_site/expected/diagrams/object.png b/packages/cli/test/functional/test_site/expected/diagrams/object.png
diff --git a/packages/cli/test/functional/test_site/expected/diagrams/sequence.png b/packages/cli/test/functional/test_site/expected/diagrams/sequence.png
diff --git a/packages/cli/test/functional/test_site/expected/diagrams/state.png b/packages/cli/test/functional/test_site/expected/diagrams/state.png
diff --git a/packages/cli/test/functional/test_site/expected/diagrams/usecase.png b/packages/cli/test/functional/test_site/expected/diagrams/usecase.png
diff --git a/packages/cli/test/functional/test_site/expected/inline-output.png b/packages/cli/test/functional/test_site/expected/inline-output.png
diff --git a/...test/functional/test_site/expected/sub_site/inline-output/inline-puml-image.png b/...test/functional/test_site/expected/sub_site/inline-output/inline-puml-image.png
diff --git a/packages/core/src/plugins/default/markbind-plugin-plantuml.js b/packages/core/src/plugins/default/markbind-plugin-plantuml.js
@@ -37,7 +37,7 @@ function generateDiagram(imageOutputPath, content) {
   }
 
   // Java command to launch PlantUML jar
-  const cmd = `java -jar "${JAR_PATH}" -pipe > "${imageOutputPath}"`;
+  const cmd = `java -jar "${JAR_PATH}" -nometadata -pipe > "${imageOutputPath}"`;
   const childProcess = exec(cmd);
 
   let errorLog = '';