Cleanup the way package_update_index_rpm works. Break this out into two
functions, one for common functionality and one for controlling target vs
sdk package processing.
Similar change to package_generate_rpm_conf.
Usage of IMAGE_ROOTFS should actually be "target_rootfs", this fixes a problem
with the SDK case.
in rootfs_rpm.bbclass:
Minor re-order of the values, and avoid multiple uses of IMAGE_ROOTFS in order
to make the merge with the SDK behavior easier.
Signed-off-by: Mark Hatle <mark.hatle@windriver.com>