package-metadata: add CPE information to JSON package manifests

Common Platform Enumeration (CPE) is a structured naming scheme for
information technology systems, software, and packages.

In order for the information to be processed further, it should also be
available in JSON package manifests.

Signed-off-by: Petr Štetiar <ynezz@true.cz>
(cherry picked from commit 8562c65ff8)

scripts/package-metadata.pl

@@ -609,6 +609,7 @@ ${json}{
 "version":"$pkg->{version}",
 "category":"$pkg->{category}",
 "license":"$pkg->{license}",
+"cpe_id":"$pkg->{cpe_id}",
 "maintainer": [$pkg_maintainer],
 "depends":[$pkg_deps]},
 END_JSON