webadmin: Render Provider/Networks subtab columns sortable

All text columns, so enough to switch on the default
TextColumnWithTooltip sorting.

Change-Id: Id7f4da05a61affa686cc6073a91ea018dfdcf9df
Bug-Url: https://bugzilla.redhat.com/1120054
Signed-off-by: Lior Vernia <lvernia@redhat.com>