Support OVAL scan for Amazon Linux

[kotakanbe]

What did you do? (required. The issue will be closed when not provided.)

What did you expect to happen?

What happened instead?

• Current Output

Please re-run the command using -debug and provide the output below.

Steps to reproduce the behaviour

Configuration (MUST fill this out):

• Go version (go version):

• Go environment (go env):

• Vuls environment:

Hash : ____

To check the commit hash of HEAD
$ vuls -v

or

$ cd $GOPATH/src/github.com/future-architect/vuls
$ git rev-parse --short HEAD

• config.toml:

• command:

[kotakanbe]

merged
#824