Option to Skip Monkey Patching with LOCUST_SKIP_MONKEY_PATCH

[andrewbaldwin44]

Proposal

1. Add a condition to the __init__.py that will skip monkey patching when LOCUST_SKIP_MONKEY_PATCH is set
2. Update use-as-lib to document disabling monkey patching

Tested

Tested using Locust as a lib with boto3

Fixes #2250

[cyberw]

Cool! Would it work if we also automatically skipped monkey patching if it has already been done, like this?

if not monkey.is_module_patched("thread"):
    monkey.patch_all()
else:
    print("Skipping monkey patching, because it had already been performed")

[andrewbaldwin44]

That was the first thing I tried, unfortunately it doesn't work. I went with this solution since I saw both yourself and Heyman suggested it in another thread