[KNIFE_RACKSPACE-30] Make use of --json-attributes option for knife b…

…ootstrap.

lib/chef/knife/rackspace_server_create.rb

@@ -101,6 +101,13 @@ class RackspaceServerCreate < Knife
         :description => "Comma separated list of roles/recipes to apply",
         :proc => lambda { |o| o.split(/[\s,]+/) },
         :default => []
+
+      option :first_boot_attributes,
+        :short => "-j JSON_ATTRIBS",
+        :long => "--json-attributes",
+        :description => "A JSON string to be added to the first run of chef-client",
+        :proc => lambda { |o| JSON.parse(o) },
+        :default => {}
 
       option :rackspace_metadata,
         :short => "-M JSON",
@@ -192,6 +199,7 @@ def bootstrap_for_node(server)
         bootstrap = Chef::Knife::Bootstrap.new
         bootstrap.name_args = [public_dns_name(server)]
         bootstrap.config[:run_list] = config[:run_list]
+        bootstrap.config[:first_boot_attributes] = config[:first_boot_attributes]
         bootstrap.config[:ssh_user] = config[:ssh_user] || "root"
         bootstrap.config[:ssh_password] = server.password
         bootstrap.config[:identity_file] = config[:identity_file]