Clean up existing legacy echo server

When re-running dev_setup script, the existing legacy echo server needs
to be stopped first for it holds the port.The old soft link
"/etc/init.d/echoserver" also needs to be removed or the link to new
echoserver will fail to be created.Besides, the legacy echo server under
both "tmp" directory and "CLOUDFOUNDRY_HOME/.deployments/devbox/deploy"
directory should be cleaned.

Change-Id: I4c58ef2d68d4a37a8a7bd2b8db8c9b7aec236afe

dev_setup/cookbooks/echo/recipes/default.rb

@@ -16,12 +16,26 @@
 
   bash "Install Echo Server" do
     code <<-EOH
+      if [ -L "/etc/init.d/echoserver" ]; then
+        service echoserver stop
+        rm /etc/init.d/echoserver
+      fi
+
+      if [ -d "/tmp/echoserver/" ]; then
+        rm -rf /tmp/echoserver/
+      fi
+
+      if [ -d #{File.join(node[:echo_server][:path])} ]; then
+        rm -rf #{File.join(node[:echo_server][:path])}
+      fi
+
       unzip #{echoserver_tarball_path} -d /tmp
       cp -r /tmp/echoserver #{File.join(node[:deployment][:home], 'deploy')}
       ln -s -f -t /etc/init.d/ #{File.join(node[:echo_server][:path], 'echoserver')}
     EOH
     not_if do
-      ::File.exists?(File.join(node[:echo_server][:path], 'echoserver'))
+      File.symlink?("/etc/init.d/echoserver") and \
+      (File.join(node[:echo_server][:path], 'echoserver') == File.readlink("/etc/init.d/echoserver"))
     end
   end
 

dev_setup/cookbooks/echo/templates/default/echoserver.erb

@@ -85,6 +85,10 @@ kill_and_wait() {
 
 start_echoserver() {
     echo "starting echo server"
+    lsof -i:<%= node[:echo_server][:port] %> > /dev/null \
+    && echo "Port <%= node[:echo_server][:port] %> is not available" \
+    && exit 1
+
     java \
        -jar $ECHOSEVER_ROOT/lib/EchoServer-0.1.0.jar \
        -port <%= node[:echo_server][:port] %>  \