Add vt info to results

[jjnicola]

DEPENDS on greenbone/gvm-libs#568

What:
Results format is changed and now include the fields

• name, the script name
• QoD, quality of detection
• Score, calculated from the vector found in the vt.

Those fields are optional and will be added only if there is an OID

Why:
This task is done currently by ospd-openvas and must be moved to openvas.

How:

• Use mosquitto_sub to subscribe the topic "scanner/results"
• Run a small scan.
• Check that results contains a severity, qod and name fields.

scanner/results {"scan_id":"829097a9-85d5-4bb8-bac0-e64c362b2836","type":"LOG","host_ip":"192.168.123.52","hostname":"192.168.0.1","port":"22/tcp","OID":"1.3.6.1.4.1.25623.1.0.90022","name":"SSH Authorization Check","qod":"80","severity":"0.0","value":"It was possible to login using the provided SSH credentials. Hence authenticated checks are enabled.\n","uri":""}

Checklist:

• Tests
• CHANGELOG Entry