cve-update-db: do_populate_cve_db depends on do_fetch
To be able to populate NVD database on a fetchall
(bitbake <image> --run-all=fetch), set the do_populate_cve_db task to be
executed before do_fetch.
Do not get CVE_CHECK_DB_DIR, CVE_CHECK_DB_FILE and CVE_CHECK_TMP_FILE
variable because do_populate_cve_db can be called in a context where
cve-check class is not loaded.
Signed-off-by: Pierre Le Magourou <pierre.lemagourou@softbankrobotics.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
