Sort host_aggregate hosts list for comparison

Sort the list of hosts in the aggregate, both from the
provider/nova API as well as from the resource definition
in the manifest.  This allows for more accurate comparison
to determine if the resource really needs to be updated or
not.

Change-Id: I10a1995eb58e4bcd492bb7d6f94453a29cb31097
Closes-bug: 1534845

lib/puppet/provider/nova_aggregate/nova.rb

@@ -21,7 +21,7 @@ Puppet::Type.type(:nova_aggregate).provide(
           :id => attrs['Id'],
           :availability_zone => attrs['Availability Zone'],
           :metadata => attrs['Metadata'],
-          :hosts => attrs['Hosts']
+          :hosts => attrs['Hosts'].sort
           )
     end
   end

lib/puppet/type/nova_aggregate.rb

@@ -99,7 +99,7 @@ Puppet::Type.newtype(:nova_aggregate) do
     desc 'Single host or comma seperated list of hosts'
     #convert DSL/string form to internal form
     munge do |value|
-      return value.split(",").map{|el| el.strip()}
+      return value.split(",").map{|el| el.strip()}.sort
     end
   end