For each recipe, it populated license files to ${LICENSE_DIRECTORY}/${PN},
such as kernel's license dir was ${LICENSE_DIRECTORY}/kernel-3.10.17-yocto-standard;
In do_rootfs task, it copied license directories from ${LICENSE_DIRECTORY}/
${pkg}, and ${pkg} was listed in ${INSTALLED_PKGS};
We got ${INSTALLED_PKGS} by rpm query, such as the kernel were 'kernel-*',
but the kernel's PN was linux-yocto, so searching ${LICENSE_DIRECTORY}/
kernel-* failed.
Copied license directories from ${LICENSE_DIRECTORY}/${PN} fixed this issue.
