vyos-kernel: enable realtek rtl8723ae kernel modules for all configs

Include the kernel modules for Realtek RTL8723AE cards for all the
kernel flavours.  These were added for the amd64 flavour in commit
c896903140bda9246be76cc113e509d8d56ab452

Bug #280 http://bugzilla.vyos.net/show_bug.cgi?id=280
vyos-kernel: enable kernel stack overflow protection for all configs

Enable kernel stack overflow protection for all the kernel flavours.
The standard stack protection is enabled in most distribution kernels
and doesn't have the expensive overheads it used to do.
This was enabled for the amd64 flavour in commit
c535b393bb9cbabef502b39728ffe9b72c7afc05

Bug #281 http://bugzilla.vyos.net/show_bug.cgi?id=281
vyos-kernel: disable host virtualisation in the 586-vyos-virt config

Disable host virtualisation in the kernel config file for 586-vyos-virt
as this is only for deploying virtual guests on the host, not for
running in a virtualised environment.  This was disabled for the amd64
flavour in commit e40671e8ebcae1e8770eb2754533ae1eb2f17bef

Bug #282 http://bugzilla.vyos.net/show_bug.cgi?id=282
vyos-kernel: disable kernel debugging for all configs

Disable kernel debuging in the kernel config file for 586-vyos and
586-vyos-virt kernels.  Removing debugging support adds less kernel
based overheads for something that will be rarely used in a production
environment. This was disabled for the amd64 flavour in commit
1cc1b7cd4abd0f9cb6a51fa2f266ed32e685e3da

Possibly need to look at introducing a debug build for non production
systems.

Bug #283 http://bugzilla.vyos.net/show_bug.cgi?id=283