Remove unused import

Author: rjernst

buildSrc/src/main/java/org/elasticsearch/gradle/test/DistroTestPlugin.java

@@ -46,7 +46,6 @@
 import org.gradle.api.plugins.JavaBasePlugin;
 import org.gradle.api.provider.Provider;
 import org.gradle.api.specs.Specs;
-import org.gradle.api.tasks.Copy;
 import org.gradle.api.tasks.TaskProvider;
 import org.gradle.api.tasks.testing.Test;