[Bug] OTXQuery_2_0 analyzer does not work

[lukaszrzasik]

Describe the bug
OTXQuery_2_0 analyzer does not work after switching to python3.

To Reproduce
Steps to reproduce the behavior:

1. Configure OTXQuery_2_0 analyzer
2. Click New Analysis
3. Choose data type: ip
4. Put '8.8.8.8' into Data field
5. Mark OTXQuery_2_0 analyzer in the list of Analyzers.
6. Click Start

Expected behavior
A successful result from the analyzer.

Actual behaviour
The analyzer fails with the following error:
{
"errorMessage": "API Error! Please verify data type is correct.",
"input": "{"dataType":"ip","tlp":2,"data":"8.8.8.8","pap":2,"config":{"max_pap":2,"jobTimeout":30,"auto_extract_artifacts":false,"key":"REMOVED","check_pap":true,"proxy_http":null,"cacerts":null,"proxy_https":null,"max_tlp":2,"check_tlp":true,"jobCache":10},"message":"","parameters":{}}",
"success": false
}

[lukaszrzasik]

The issue is solved by this PR: #851

[dadokkio]

Merged in develop. Thanks for the fix!