cve-check: add option to add additional patched CVEs

cve-check: add option to add additional patched CVEs

- Replace CVE_CHECK_IGNORE with CVE_STATUS to be more flexible.
The CVE_STATUS should contain an information about status wich
is decoded in 3 items:
- generic status: "Ignored", "Patched" or "Unpatched"
- more detailed status enum
- description: free text describing reason for status

Examples of usage:
CVE_STATUS[CVE-1234-0001] = "not-applicable-platform: Issue only applies on Windows"
CVE_STATUS[CVE-1234-0002] = "fixed-version: Fixed externally"

CVE_CHECK_STATUSMAP[not-applicable-platform] = "Ignored"
CVE_CHECK_STATUSMAP[fixed-version] = "Patched"

Signed-off-by: Andrej Valek <andrej.valek@siemens.com>
Signed-off-by: Peter Marko <peter.marko@siemens.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>