Allow calling Lambda from an Application Load Balancer (ALB)

[bjorn-spire]

You can use lambda together with Application Load Balancer (ALB)
which uses a different set of keys than previously set. This change
makes more checks to ensure that when trying to use more keys
then they exist (or, at least one of the keys exist and we assume
it's a representative sample).

I also went ahead and added py37 support to tox since it's available in Lambda these days.

And with a PR a cute animal picture, this is a culogo or flying lemur! :D

[bjorn-spire]

I don't understand the Travis error, I don't understand why it would complain about Google Compute Engine?

ConftestImportFailure: (local('/home/travis/build/Netflix-Skunkworks/raven-python-lambda/raven_python_lambda/tests/conftest.py'), (<type 'exceptions.ImportError'>, ImportError('No module named google_compute_engine',), <traceback object at 0x7f8bee004488>))

[bjorn-spire]

Okay, seems to be something with boto having it in there. I can't replicate it locally :( Seem to be generally running the same versions and tox across py27, py36, and py37 works. Maybe one of you core maintainers know what this may be about?

[bjorn-spire]

Okay, so I couldn't leave it be and it seems to be because of some weird Travis configuration: travis-ci/travis-ci#7940

By adding a step to remove /etc/boto.cfg before running all the tests they're running again.