Tweaked module error message against non integ-test-zip and made checks

for limiting configuration to certain distributions prettier

buildSrc/src/main/groovy/org/elasticsearch/gradle/test/ClusterFormationTasks.groovy

@@ -300,7 +300,7 @@ class ClusterFormationTasks {
 
     static Task configureInstallModuleTask(String name, Project project, Task setup, NodeInfo node, Project module) {
         if (node.config.distribution != 'integ-test-zip') {
-            throw new GradleException("Module ${module.path} cannot be installed in cluster which is not using integ-test-zip")
+            throw new GradleException("Module ${module.path} not allowed be installed distributions other than integ-test-zip because they should already have all modules bundled!")
         }
         if (module.plugins.hasPlugin(PluginBuildPlugin) == false) {
             throw new GradleException("Task ${name} cannot include module ${module.path} which is not an esplugin")

distribution/build.gradle

@@ -139,7 +139,7 @@ subprojects {
 /*****************************************************************************
  *                         Zip and tgz configuration                         *
  *****************************************************************************/
-configure(subprojects.findAll { it.name == 'zip' || it.name == 'tar' || it.name == 'integ-test-zip' }) {
+configure(subprojects.findAll { ['zip', 'tar', 'integ-test-zip'].contains(it.name) }) {
   project.ext.archivesFiles = copySpec {
     into("elasticsearch-${version}") {
       with libFiles
@@ -182,7 +182,7 @@ configure(subprojects.findAll { it.name == 'zip' || it.name == 'tar' || it.name
  *    directly from the filesystem. It doesn't want to process them through
  *    MavenFilteringHack or any other copy-style action.
  */
-configure(subprojects.findAll { it.name == 'deb' || it.name == 'rpm' }) {
+configure(subprojects.findAll { ['deb', 'rpm'].contains(it.name) }) {
   integTest.enabled = Os.isFamily(Os.FAMILY_WINDOWS) == false
   File packagingFiles = new File(buildDir, 'packaging')
   project.ext.packagingFiles = packagingFiles