pkg-stats: add license information, rework information displayed

pkg-stats: add license information, rework information displayed

Now that most packages have been converted over to package
infrastructures, keep only one column to show the package
infrastructures.

A new column, showing of the package has license information, has been
added. This will help in increasing the number of packages having
license metadata.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>