Change KB links to avd

[danielsagi]

Description

Updated KB links to link to avd.aquasec.com

In general table reporting, this will be seen as:

...
Vulnerabilities
For further information about a vulnerability, search its ID in:
https://avd.aquasec.com/
+--------+---------------------+----------------------+----------------------+----------------------+------------+
...

And in json reporting, we build the full avd url and adding it to the resulting vulnerability object. as a new avd_reference var

{
  "location":"127.0.0.1:10250",
  "vid":"KHV040",
  "category":"Remote Code Execution",
  "severity":"high",
  "vulnerability":"Exposed Run Inside Container",
  "description":"An attacker could run an arbitrary command inside a container",
  "evidence":"",
  "avd_reference":"https://avd.aquasec.com/kube-hunter/khv040/",
  "hunter":"Kubelet Secure Ports Hunter"
}

Fixed Issues

closes #405

Contribution checklist

• [x] I have read the Contributing Guidelines.
• [ ] The commits refer to an active issue in the repository.
• [ ] I have added automated testing to cover this case.

[codecov[bot]]

Codecov Report

Merging #406 (d20e5c8) into master (35873ba) will increase coverage by 0.08%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #406      +/-   ##
==========================================
+ Coverage   63.47%   63.56%   +0.08%     
==========================================
  Files          42       42              
  Lines        2289     2289              
==========================================
+ Hits         1453     1455       +2     
+ Misses        836      834       -2     

Impacted Files	Coverage Δ
kube_hunter/modules/report/base.py	30.30% <100.00%> (+5.30%)	:arrow_up:
kube_hunter/modules/report/plain.py	12.50% <100.00%> (-0.99%)	:arrow_down:
kube_hunter/core/events/handler.py	91.08% <0.00%> (+0.99%)	:arrow_up:

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