webadmin: reset page to 1 on sort

- In the scenaria where you have multiple pages and you select
  and item, it is possible for a sort operation to make the
  selected item unavailable on the current page. This leaves the
  user on a page that is no longer of interest to them. So to
  not confuse the user too much we will reset the page to the first
  page when sorting.

Change-Id: I0b0a974c65c261081f1c942b2b35e75e806a86a6
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1119309
Signed-off-by: Alexander Wels <awels@redhat.com>