Policy Re-configure UI

Working, tested with reconfigurable autoscaler policy, min/max pool size.

> There is still an issue with setting values for certain keys (sensor min/max values), and multi-page data tables flick back to the first page on refresh of values, but this looks like it is an issue with all other data tables in the UI, so I am going stop now, and defer further work to someone with better JS skills

The pagination and config key setting issues are solved, however there is a delay between selecting the policies tab and the list of policies being displayed that still occurs, even when the REST queries are made synchronously.