package/xen: xen tools needs bash at runtime

When the Xen tools are built, a number of init scripts are installed to
the target.

Some of those Xen scripts require bash to run:
- /etc/init.d/S50xencommons
- /etc/init.d/S50xen-watchdog
- /etc/init.d/S60xendomains
- /etc/xen/scripts/launch-xenstore
- /usr/lib/xen/bin/xendomains

Make sure to select bash when the Xen tools are selected (we need to
select "busybox show others" for that, too).

Suggested-by: Julien Olivain <ju.o@free.fr>
Signed-off-by: Vincent Stehlé <vincent.stehle@laposte.net>
Cc: Alistair Francis <alistair@alistair23.me>
Signed-off-by: Julien Olivain <ju.o@free.fr>
(cherry picked from commit bf18fd4cd183eab2e91b91d275fc62e2707b9182)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/xen/Config.in

@@ -33,6 +33,8 @@ config BR2_PACKAGE_XEN_TOOLS
 	select BR2_PACKAGE_UTIL_LINUX_LIBUUID
 	select BR2_PACKAGE_YAJL
 	select BR2_PACKAGE_ARGP_STANDALONE if !BR2_TOOLCHAIN_USES_GLIBC
+	select BR2_PACKAGE_BASH # runtime (scripts)
+	select BR2_PACKAGE_BUSYBOX_SHOW_OTHERS if BR2_PACKAGE_BUSYBOX # bash
 	help
 	  The Xen tools can be accessed by the xl command.