busybox: automatically enable/disable init configs
busybox: automatically enable/disable init configs

If VIRTUAL-RUNTIME_init_manager is set to busybox, busybox
must be built with init applet and related features.
Otherwise, must be built without them.

This commit allows busybox to automatically enable/disable
configs listed in BUSYBOX_INIT_CONFIGS in do_configure
according to the value of VIRTUAL-RUNTIME_init_manager.

Signed-off-by: Kazuhiro Hayashi <d6ab13038406a238a56011921c4eda80a48396fd@toshiba.co.jp>

meta-debian/meta-debian,tienlee/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,nghiaht-tsdv/meta-debian,nghiaht-tsdv/meta-debian,nghiaht-tsdv/meta-debian,meta-debian/meta-debian,nghiaht-tsdv/meta-debian,tienlee/meta-debian,meta-debian/meta-debian,tienlee/meta-debian,meta-debian/meta-debian,nghiaht-tsdv/meta-debian,tienlee/meta-debian,meta-debian/meta-debian,nghiaht-tsdv/meta-debian,tienlee/meta-debian