Replace usage of oe.utils.getstatusoutput() with direct subprocess calls.
(From OE-Core rev: 90c730a898f11adb2ecd377cdd913af83123bcb7)
Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>