title: Change manifestPlaceholders in androidTest manifest
body: <p>I have got manifest placeholder for service:</p>
  
  <pre><code>&lt;service
          android:name=".MyService"
          android:process="${processName}"&gt;
  </code></pre>
  
  <p>In my build.gradle I replaced it.</p>
  
  <pre><code>android {  
      defaultConfig {
          manifestPlaceholders = [
                  processName: ':Proc'
          ]
      }
  }
  </code></pre>
  
  <p>But for my espresso tests (androidTest) I need empty value in the <code>processName</code>. How can I do this?</p>
  
  <p>I have tried to do this with buildTypes, but it doesn't work (BuildType names cannot start with "androidTest")</p>