debian-cve-check.bbclass: add new class
debian-cve-check.bbclass: add new class

Task cve-check only looks at NVD database.
This class check CVEs with Debian Security Tracker
and pass the fixed CVEs to cve-check as whitelist.

meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian,meta-debian/meta-debian