Upgrade versions of nodejs and yarn

and use a consistent version across modules

build.gradle

@@ -286,6 +286,16 @@ subprojects {
     ide.dependsOn(['generateProto', 'generateTestProto'])
   }
 
+  if (file('package.json').exists()) {
+    apply plugin: 'com.moowork.node'
+
+    node {
+      version = '8.11.4'
+      yarnVersion = '1.9.4'
+      download = true
+    }
+  }
+
   if (official) {
     jar {
       // do not break incremental build on non official versions

server/sonar-docs/build.gradle

@@ -8,14 +8,6 @@ sonarqube {
 
 group = 'com.sonarsource.sonarqube'
 
-apply plugin: 'com.moowork.node'
-
-node {
-  version = '8.10.0'
-  yarnVersion = '1.5.1'
-  download = true
-}
-
 yarn_run {
   inputs.dir('src').withPathSensitivity(PathSensitivity.RELATIVE)
   inputs.files('gatsby-config.js', 'gatsby-node.js', 'package.json', 'yarn.lock')

server/sonar-vsts/build.gradle

@@ -9,14 +9,6 @@ sonarqube {
   }
 }
 
-apply plugin: 'com.moowork.node'
-
-node {
-  version = '8.10.0'
-  yarnVersion = '1.7.0'
-  download = true
-}
-
 yarn_run {
   ['config', 'public', 'scripts', 'src'].each {
     inputs.dir(it).withPathSensitivity(PathSensitivity.RELATIVE)

server/sonar-web/build.gradle

@@ -9,8 +9,6 @@ sonarqube {
   }
 }
 
-apply plugin: 'com.moowork.node'
-
 configurations {
   branding
 }
@@ -49,12 +47,6 @@ task copyBranding() {
   dependsOn copyBrandingFile
 }
 
-node {
-  version = '8.10.0'
-  yarnVersion = '1.7.0'
-  download = true
-}
-
 yarn_run {
   if (official) { dependsOn copyBranding }
   ['config', 'public', 'scripts', 'src', '../sonar-docs/src'].each {