Update custom ftrack session attributes

[iLLiCiTiT]

Issue

Ftrack api's Session has new attribute which is not available in our modified Session so it is not possible to start ftrack server with newer versions of ftrack api.

Changes

• new ftrack api session has new attribute request_timeout which is not available in modified session class
  • few updates in custom session

[hound]

Some files could not be reviewed due to errors:

Traceback (most recent call last):

Traceback (most recent call last):
  File "/home/linters/.local/bin/flake8", line 5, in 
    from flake8.main.cli import main
ModuleNotFoundError: No module named 'flake8'

[hound]

Some files could not be reviewed due to errors:

Traceback (most recent call last):

Traceback (most recent call last):
  File "/home/linters/.local/bin/flake8", line 5, in 
    from flake8.main.cli import main
ModuleNotFoundError: No module named 'flake8'