[cloudstack] Add get volumes for server

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

@@ -50,7 +50,12 @@ module Fog
         end
 
         def ip_addresses
-          addresses.map{|a| a.ip_address}
+          addresses.map(&:ip_address)
+        end
+
+        def volumes
+          requires :id
+          service.volumes.all('virtualmachineid' => id)
         end
 
         def public_ip_addresses

lib/fog/cloudstack/models/compute/volumes.rb

@@ -7,8 +7,9 @@ module Fog
       class Volumes < Fog::Collection
         model Fog::Compute::Cloudstack::Volume
 
-        def all
-          data = service.list_volumes["listvolumesresponse"]["volume"] || []
+        def all(attributes = {})
+          response = service.list_volumes(attributes)
+          data = response["listvolumesresponse"]["volume"] || []
           load(data)
         end