docs: remove obsolete docs about gitorious and cvs access
docs: remove obsolete docs about gitorious and cvs access

The gitorious.org service went away a long time ago now, and our main
download.html page tells people where all the official mirrors are
for every component.

Meanwhile telling people about CVS is a bad joke in 2018, and the CVS
server no longer exists on libvirt.org

Reviewed-by: Pavel Hrdina <d4772d05997b8abf035041e3b4f4996380ea7e7a@redhat.com>
Signed-off-by: Daniel P. Berrangé <bb938cf255e055ff3507f2627d214e8e62118fcf@redhat.com>

fabianfreyer/libvirt,crobinso/libvirt,fabianfreyer/libvirt,libvirt/libvirt,eskultety/libvirt,jardasgit/libvirt,zippy2/libvirt,jardasgit/libvirt,nertpinx/libvirt,olafhering/libvirt,zippy2/libvirt,jfehlig/libvirt,jfehlig/libvirt,olafhering/libvirt,nertpinx/libvirt,crobinso/libvirt,libvirt/libvirt,eskultety/libvirt,andreabolognani/libvirt,andreabolognani/libvirt,libvirt/libvirt,jardasgit/libvirt,jardasgit/libvirt,eskultety/libvirt,libvirt/libvirt,nertpinx/libvirt,andreabolognani/libvirt,nertpinx/libvirt,zippy2/libvirt,zippy2/libvirt,nertpinx/libvirt,andreabolognani/libvirt,crobinso/libvirt,eskultety/libvirt,jfehlig/libvirt,olafhering/libvirt,olafhering/libvirt,eskultety/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,crobinso/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,fabianfreyer/libvirt