scripts/sstate-cache-management.sh: fix return value by adding exit 0

* usefull for jenkins jobs, which will otherwise fail
  because 1 was returned

Signed-off-by: Henning Heinold <heinold@inf.fu-berlin.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
qemuimage-testlib-pythonhelper: Fix process mixups

runqemu-internal runs "ldd qemu-system xxx" and the detection code was returning this
as the PID of qemu. This patch improves the detection code to avoid this problem,
fixing certain race type failures on the autobuilder.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
site/common-uclibc: add predefined configure vars for coreutils

* this sets some configure vars which will be guessed
  false in cross-compile case for uclibc

Signed-off-by: Henning Heinold <heinold@inf.fu-berlin.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>