Add EICAR archive to live_test

[austinbyers]

to: @chunyong-lin
cc: @airbnb/binaryalert-maintainers
size: medium

Background

The live_test has proven to be an extremely useful feature - it uploads a test file and checks whether BinaryAlert processed a YARA match for it or not (it's an end-to-end test).

Since the archive analysis is achieved through a different path (yextend), we want to include archives in the live test to make sure those are being matched correctly.

Changes

• Moves the live_test functionality into its own file
• Adds eicar.txt and eicar.tar.gz.bz2 test files, both of which should match the EICAR YARA rule
• Minor S3 terraform change to delete expired object markers

Testing

• Deploy to test account, and then running live_test over and over

The test coverage dropped about 3% just due to moving the live_test into its own file. We can add unit tests for it later if we want, but it's not a high priority because it's just testing logic

[coveralls]

Coverage decreased (-2.9%) to 92.941% when pulling cd7dd18 on austin-delete-expired into cebb706 on master.

[chunyong-lin]

LGTM

[chunyong-lin]

@austinbyers I have stamped on this PR, but the branch has conflicts.

[coveralls]

Coverage decreased (-2.9%) to 92.99% when pulling 80db197 on austin-delete-expired into d443913 on master.