added time delay between requests to run parallel module scans

[pUrGe12]

Proposed change

Fix for issue #616. The issue is likely happening due to race conditions with python's garbage collector trying to delete a loop that's running causing the BaseEventLoop.__del__ exception, which causes the _sock exception. The simple fix for this is to give a small delay to in between each request to let threads finish execution and let python handle the deletion properly.

If we run the following command with this change,

 python3 nettacker.py -i google.com --profile http -t 1100 -M 5

We get the complete output without errors. It should also be noted that the delay doesn't cause problems in parallel execution because we only delay threads. Using await asyncio.sleep() also won't matter much because there are no async tasks to handle control to.

Additionally, since its the CPU handling the threads, with time.sleep() it removes the asleep thread from the queue, hence sleep here won't block execution for other threads.

Type of change

• New core framework functionality
• Bugfix (non-breaking change which fixes an issue)
• Code refactoring without any functionality changes
• New or existing module/payload change
• Localization improvement
• Dependency upgrade
• Documentation improvement

Checklist

• I've followed the [contributing guidelines][contributing-guidelines]
• I've run make pre-commit, it didn't generate any changes
• I've run make test, all tests passed locally

[pUrGe12]

Closing this now, a better solution can be implemented.