This will be useful when also moving postinst_intercept handling to
package manager class from rootfs class.
(From OE-Core rev: a4cd69bdd5b9dfa1125887f4d9038d41996e39c7)
Signed-off-by: Alexander Kanavin <alexander.kanavin@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>