qemu.conrol.kernel-version: Update the mechanism used to filter host version to reduce the time cost.

Current code will filter host version in every case dict, which will need long time.
In new code, Only filter host version before parser the config and only add correct
host config to host-kernel.

Signed-off-by: Feng Yang <fyang@redhat.com>
qemu.cfg: Delete host-kernel.cfg and seprate the config to host-kernel folder and host-kernel-base.cfg.

Also add host-kernel-check.cfg to host-kernel folder. It only contains the config used
to filder host version. This file only used in control.kernel-version.

host-kernel.cfg will be auto created according to host-kernel-base.cfg and  host-kernel folder.

Whenever you add a new host type to host-kernel folder, please also add it to
 host-kernel-check.cfg. Or script could not filter out this host type.

Add rhel.6.4 and rhel.6.5 host config.

Signed-off-by: Feng Yang <fyang@redhat.com>