fix(scan): a bug of kernel Vulns detection on Ubuntu18

[kotakanbe]

What did you implement:

The key name of a kernel has been changed in OVAL for Ubuntu 18.
I fixed the detection logic.

Not fixed yet in a report is also fixed.
Use not fixed yet data in OVAL except for CentOS.
OVAL detection for CentOS uses RHEL's OVAL.
The patch provided status is different from CentOS and RHEL.
So, the Version comparison(new version vs fixed in version in OVAL) is needed to judge fixed or not fixed yet for CentOS.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

diff

 ~/w/u18  ls                                                                                                                                        Thu May 23 16:45:23 2019
localhost.json     localhost.json.new
 ~/w/u18  diff *                                                                                                                                    Thu May 23 16:45:23 2019
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Checklist:

You don't have to satisfy all of the following.

• Write tests
• Write documentation
• Check that there aren't other open pull requests for the same issue/feature
• Format your source code by make fmt
• Pass the test by make test
• Provide verification config / commands
• Enable "Allow edits from maintainers" for this PR
• Update the messages below

Is this ready for review?: YES