ACCUMULO-4490 Simplify Accumulo scripts and config

* Created accumulo-service & accumulo-cluster commands
* Updated accumulo command and improved usage
* Native libraries are not built using 'accumulo build-native'
* Accumulo config is now created using 'accumulo create-config'
* The release only contains one set of example config in 'conf/examples'
* Updated INSTALL.md to reflect script and config changes
* Accumulo falls back to conf/examples when configuring logging
* Combined several cluster-related scripts into cluster.sh
* Combined service/daemon related scripts in service.sh
* Deleted config scripts and created load-env.sh
* Moved build-native-library code from script to accumulo command
* Reduced number of directories in tarball by placing scripts in lib
  and examples, test, and proxy into new opt directory
* Updated script references in documentation
* Removed unnecessary classpath settings in core/src/test files
* Removed accumulo-site.xml in core/src/test that is not being used
diff --git a/README b/README
index 1f44a9c..a25acec 100644
--- a/README
+++ b/README
@@ -46,7 +46,7 @@
 
 Run the following command.
 
- ${ACCUMULO_HOME}/bin/accumulo proxy -p ${ACCUMULO_HOME}/proxy/proxy.properties
+ ./bin/accumulo proxy -p ./opt/proxy/proxy.properties
 
 5. Clients
 
diff --git a/src/main/java/org/apache/accumulo/proxy/Proxy.java b/src/main/java/org/apache/accumulo/proxy/Proxy.java
index a3d185d..5bfa808 100644
--- a/src/main/java/org/apache/accumulo/proxy/Proxy.java
+++ b/src/main/java/org/apache/accumulo/proxy/Proxy.java
@@ -113,6 +113,11 @@
   }
 
   @Override
+  public String description() {
+    return "Start Accumulo proxy";
+  }
+
+  @Override
   public void execute(final String[] args) throws Exception {
     Opts opts = new Opts();
     opts.parseArgs(Proxy.class.getName(), args);