remove yarn artifact from main build

relates to elastic#154

build.gradle

@@ -384,12 +384,6 @@ jar {
 	manifest.attributes['Repository-Revision'] = rev
 }
 
-configure(jar) {
-	if (hadoopDistro == "hadoopYarn") {
-		classifier = 'yarn'
-	}
-}
-
 // this is in just as a convenience - the official docs are generated through an external process
 asciidoctor {
 	//logDocuments = true
@@ -472,19 +466,6 @@ task distZip(type: Zip, dependsOn: [jar, sourcesJar, javadocJar]) {
     }
 }
 
-artifacts {
-
-	// include YARN is available
-	ext.yarn = file("$libsDir/$name-$version-yarn.jar")
-	if (yarn.exists()) {
-		archives yarn
-	}
-
-	//files(subprojects.configurations.archives.artifacts.file).each { File file ->
-	//   archives file
-	//}
-}
-
 task wrapper(type: Wrapper) {
     description = 'Generates gradlew[.bat] scripts'
     gradleVersion = '1.8'