[framework] Add an autouse fixture to disable and enable container autorestart.

[bingwang-ms]

Description of PR

Summary:
Fixes # (issue)

Type of change

• Bug fix
• Testbed and Framework(new/improvement)
• Test case(new/improvement)

Approach

What is the motivation for this PR?

The autorestart of containers may hide errors in tests. This commit add an autouse fixture to disable and enable autouse feature. For module with marker enable_container_restart, this fixture is skipped.

How did you do it?

An autouse fixture is added at module level, which disable autorestart for all containers at the beginning, and does a revovery at the end of test.
Why not session level?
If the fixture is set to session level, it will be impossible to disable this fixture for certain test case.

How did you verify/test it?

Veified on Arista 7260.

py.test -vvvvv --inventory ../ansible/str,../ansible/veos --host-pattern str-7260cx3-acs-1 --module-path ../ansible/library/ --testbed vms7-t0-7260-1 --testbed_file ../ansible/testbed.csv --junit-xml=tr.xml --log-cli-level info --collect_techsupport=False --topology=t0,any,util test_demo.py
collected 1 item                                                                                                                                                                                      

test_demo.py::test_demo 
------------------------------------------------------------------------------------------- live log setup --------------------------------------------------------------------------------------------

07:42:38 INFO conftest.py:disable_container_autorestart:443: Disable container autorestart
PASSED                                                                                                                                                                                          [100%]
------------------------------------------------------------------------------------------ live log teardown ------------------------------------------------------------------------------------------
07:42:48 INFO conftest.py:disable_container_autorestart:450: Recover container autorestart


------------------------------------------------------------------ generated xml file: /data/Networking-acs-sonic-mgmt/tests/tr.xml -------------------------------------------------------------------
====================================================================================== 1 passed in 23.05 seconds ======================================================================================

Any platform specific information?

No.

Supported testbed topology if it's a new test case?

N/A.

Documentation

No.