message: upgrade yarn and the frontend maven plugin fix
diff: <!-- Build properties -->
  <java.version>1.8</java.version>
  <maven.version>3.0.0</maven.version>
  - <node.version>v6.10.0</node.version>
  - <yarn.version>v0.21.3</yarn.version>
  + <node.version>v6.11.5</node.version>
  + <yarn.version>v1.2.1</yarn.version>
  <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
  <project.testresult.directory>${project.build.directory}/test-results</project.testresult.directory>
  <maven-war-plugin.version>2.6</maven-war-plugin.version>
  <docker-maven-plugin.version>0.4.13</docker-maven-plugin.version>
  <exec-maven-plugin.version>1.5.0</exec-maven-plugin.version>
  - <frontend-maven-plugin.version>1.3</frontend-maven-plugin.version>
  + <frontend-maven-plugin.version>1.6</frontend-maven-plugin.version>
  <jacoco-maven-plugin.version>0.7.9</jacoco-maven-plugin.version>
  <!-- Sonar properties -->
  