Adds documentation about adding a patch that address a vulnerability.
The patch-policy file now explain mention that patches that address a
vulnerability needs to include a `CVE:` trailer with the reference of
that vulnerability.
Until now only adding the reference to the `_IGNORE_CVES` variable was
necessary, so the documentation of this entry is modified as well to
point to the patch policy.
Signed-off-by: Thomas Perale <thomas.perale@mind.be>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 1167d0ff3d225ca9ce2b6299da28a9307d370142)
Signed-off-by: Thomas Perale <thomas.perale@mind.be>