Incremental rpm image generation

Incremental rpm image generation, the rootfs would be totally removed and
re-created in the second generation by default, but with
INC_RPM_IMAGE_GEN = "1", the rpm based rootfs would be kept, and will do
update(remove/add some pkgs) on it.

NOTE: This is not suggested when you want to create a productive rootfs

For example:
  1) Add the follow config option to a conf file:
     INC_RPM_IMAGE_GEN = "1"

  2) bitbake core-image-sato
     modify a package
     bitbake core-image-sato

The rootfs would not be totally removed and re-created in the second
generation, it would be simply updated based on the "package".

Implatation:
1) Figure out the pkg which need to be removed or re-installed, then use
'rpm -e to remove the old one. Use the rpm's BUILDTIME to determine
which pkg has been rebuilt.

2) Figure out the pkg which is newly added, and use 'rpm -U' to install
it.

This only for the rpm based rootfs, the deb and ipk based rootfs would
be done later.

[YOCTO #1651]

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>

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