title: spring dependency-management gradle plugin doesn't download dependency
body: <p>I'm using spring dependency-management gradle plugin on IntelliJ. I've a root module with following </p>
  
  <pre><code>apply plugin: "io.spring.dependency-management"
  
  dependencyManagement {
      dependencies {
        dependencySet(group: "org.apache.hadoop", version: "2.6.0-cdh5.14.4") {
                  entry "hadoop-common"
                  entry "hadoop-hdfs"
              }
       }
  }
  </code></pre>
  
  <p>If I add</p>
  
  <pre><code>dependency 'org.apache.hadoop:hadoop-tools:2.6.0-mr1-cdh5.14.4' 
  </code></pre>
  
  <p>or</p>
  
  <pre><code>dependencySet(group: "org.apache.hadoop", version: "2.6.0-mr1-cdh5.14.4") {
      entry ("hadoop-tools") {
          exclude group: 'ch.qos.logback', module: 'logback-classic'
          exclude group: 'org.slf4j', module: 'slf4j-log4j12'
      }
  }
  </code></pre>
  
  <p>in the root module, it doesn't download the <code>hadoop-tools</code> jar. It downloads this dependency only when I add the below in the sub module.</p>
  
  <pre><code>plugins {
      id "com.github.johnrengelman.shadow" version "2.0.4"
  }
  
  dependencies {
      compile ("org.apache.hadoop:hadoop-tools:2.6.0-mr1-cdh5.14.4") {
          exclude group: 'ch.qos.logback', module: 'logback-classic'
          exclude group: 'org.slf4j', module: 'slf4j-log4j12'
      }
  }
  </code></pre>
  
  <p>Why is the behavior?</p>