Implementation of vulners script output

[lucatruf]

This PR change how the nmap 'vulners' scritpt output is parsed. The nmap 'vulners' script generate many vulnerabilities as a single output and then nmap plugin put all of them into one single vulnerability in Faraday,

This PR changes this behaviour and so the nmap plugin will generate as many vulnerabilitie as the nmap 'vulners' script find.

The nmap script is: https://nmap.org/nsedoc/scripts/vulners.html

[aenima-x]

@lucatruf Luca can you add one more thing that I forgot? Can you add the cvss score to references?

[lucatruf]

@lucatruf Luca can you add one more thing that I forgot? Can you add the cvss score to references?

@aenima-x Sure, you mean something like this?

                        {
                            "name": "1337DAY-ID-33575",
                            "desc": "vulners-1337DAY-ID-33575 *EXPLOIT*",
                            "severity": "med",
                            "refs": [
                                "https://vulners.com/zdt/1337DAY-ID-33575",
                                "CVSS 4.3"
                            ],
                            "external_id": "1337DAY-ID-33575",
                            "type": "Vulnerability",
                            "resolution": "",
                            "data": "",
                            "custom_fields": {},
                            "status": "opened",
                            "impact": {},
                            "policyviolations": [],
                            "easeofresolution": null,
                            "confirmed": false,
                            "tags": []
                        },

[aenima-x]

@lucatruf CVSS: XXX

[lucatruf]

@lucatruf CVSS: XXX

Done