added linode ssh support

lib/fog/compute/models/server.rb

@@ -13,11 +13,10 @@ module Fog
         Fog::SCP.new(public_ip_address, username, scp_options).upload(local_path, remote_path, upload_options)
       end
 
-      def ssh(commands)
+      def ssh(commands, options={})
         require 'net/ssh'
         requires :public_ip_address, :username
 
-        options = {}
         options[:key_data] = [private_key] if private_key
         Fog::SSH.new(public_ip_address, username, options).run(commands)
       end

lib/fog/linode/models/compute/server.rb

@@ -13,6 +13,17 @@ module Fog
           Fog::Compute::Linode::Ips.new :server => self, :connection => connection
         end
 
+        def public_ip_address
+          ips.last.ip
+        end
+
+        def username
+          'root'
+        end
+
+        def private_key
+        end
+
         def disks
           Fog::Compute::Linode::Disks.new :server => self, :connection => connection
         end