lib/oe/manifest.py: add library for image manifest creation

This new library allows for the creation of 2 types of manifests:
 * initial manifest - used by the new rootfs creation routines to
   generate the rootfs;
 * final_manifest - this will contain all the packages in the image,
   after all installations finished;

Usage:
  Manifest(d, manifest_dir).create_initial()
  Manifest(d, manifest_dir).create_final()
or using the provided wrapper function:
  create_manifest(d, False, manifest_dir) -> creates initial manifest
  create_manifest(d, True, manifest_dir) -> creates final manifest

If manifest_dir argument is ommited, it defaults to ${WORKDIR}.

NOTE: this commit creates fixed manifests for minimal/sato/sato-sdk
images, for Rpm & Opkg backends, in order to help speed up
development of rootfs refactoring. Dpkg initial manifest creation is
implemented.

Signed-off-by: Laurentiu Palcu <laurentiu.palcu@intel.com>

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