webadmin: Render Providers main tab columns sortable

Rendered columns sortable via server-side sorting.

Change-Id: I5843296ec00aebc3bca8e90a39dff3d2ad6541a4
Bug-Url: https://bugzilla.redhat.com/1120054
Signed-off-by: Lior Vernia <lvernia@redhat.com>