lib/oe/manifest.py: create manifests for SDK too

This commit contains several changes:
 * it is possible to create manifests for following types of images:
   regular image, target SDK and host SDK. To distinguish between these
   types of manifests, one has to pass the manifest_type argument to the
   contructor or create_manifest() wrapper. The manifest type can have
   the following values: image, sdk_host, sdk_target;
 * move image_rootfs variable to _create_dummy_initial() since it's used
   only here. This function will probably be removed in the future;
 * fix a bug in the Dpkg class;
 * add INSTALL_ORDER property to Manifest class which contains the
   default install order for the packages and will be used Rootfs/Sdk
   classes;

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

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