Tidying up the webservices menu structure (Bug #1396435)

Before, the webservices admin pages were appearing under various
different menus.

I've taken them and put them as a third tier under
the Extensions -> Webservices menu

Change-Id: I8866da25ec54ba1a98392bfde628fe5182602270
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>
Merge "Tidying up the webservices menu structure (Bug #1396435)"