Replace direct http connection with requests.Session() Using connection pool

[vbrodsky]

Description

Switch from direct http access to using Session and related Request and PreparedRequest classes. This gives us a number of advantages:

• automatic use of http connection pool and keep-alive via Session
• making the code cleaner via Session, Request, PreparedRequest classes

Immediate benefit is fix for network connections issues we had with our sdk integration tests in codefresh This was tested as follows:

• Make kubernetes context for gke_lb-cicd-codefresh_us-central1_env0 is configured locally
• Start sdk integration tests in codefresh
• Docker id is part of the codefresh run url
• Connect to codefresh docker like kubectl -n codefresh-workers exec -it dind-6697ec95c9240c841e27d1f6 -- bash
• docker ps to find the id of our test docker container
• docker exec -it 3b17acc97be7 /bin/bash
• to confirm failures run the following python snipper:

  import requests
  while True:
  response2 = requests.get('https://app.lb-stage.xyz/signin', timeout=10)
  print(response2.status_code)

• to confirm using a requests session fixes the issue, run

  import requests
  s = requests.Session()
  while True:
  response = s.get('https://app.lb-stage.xyz/signin', timeout=10)
  print(response.status_code)

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] Document change (fix typo or modifying any markdown files, code comments or anything in the examples folder only)

All Submissions

• [ ] Have you followed the guidelines in our Contributing document?
• [x] Have you provided a description?
• [x] Are your changes properly formatted?

New Feature Submissions

• [x] Does your submission pass tests?
• [ ] Have you added thorough tests for your new feature?
• [ ] Have you commented your code, particularly in hard-to-understand areas?
• [ ] Have you added a Docstring?

Changes to Core Features

• [ ] Have you written new tests for your core changes, as applicable?
• [ ] Have you successfully run tests with your changes locally?
• [ ] Have you updated any code comments, as applicable?