Fixes [YOCTO #1174]
Rpm logs will grow indefinitely, so change the config to flush those old logs.
(From OE-Core rev: e2c4dff079722f256ddcab9630b5b3f8f6421cc9)
(From OE-Core rev: f235c7a320c401fea70a578186c5cf80dd597fcd)
Signed-off-by: Mei Lei <lei.mei@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>