This is a part of a refactor that will split the package manager
code so that it's possible to use other package managers in other
layers.
(From OE-Core rev: abadf053371ce863bf21b4a9474eb61761545de1)
Signed-off-by: Fredrik Gustafsson <fredrigu@axis.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>