recipetool/create_npm: handle the licenses of the dependencies
As usual the 'LICENSE' and the 'LIC_FILES_CHKSUM' values reflects all
the license files discovered in the source tree (including the
dependencies).
For npm recipes the 'LIC_FILES_CHKSUM' value contains also the status of
the 'package.json' file of every packages as it contains license
informations.
Finally each package has a separate 'LICENSE_${PN}-package-name' value
which describes its license.
Signed-off-by: Jean-Marie LEMETAYER <jean-marie.lemetayer@savoirfairelinux.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
