Ensure license-tools zip extracts to a parent directory

Currently, extracting the license-tools zip does not create
a parent directory. This commit extracts out the `bin` and `lib`
folders inside a parent directory `license-tools-{version}`

Original commit: elastic/x-pack-elasticsearch@74960b6b1e

license-tools/build.gradle

@@ -13,11 +13,12 @@ project.forbiddenPatterns {
 dependencyLicenses.enabled = false
 
 task buildZip(type: Zip, dependsOn: jar) {
-  into('lib') {
+  String parentDir = "license-tools-${version}"
+  into(parentDir + '/lib') {
     from jar
     from configurations.runtime
   } 
-  into('bin') {
+  into(parentDir + '/bin') {
     from 'bin'
   }
 }