Start using the Avocado framework for automated regression
testing. Create a test FalcoTest in falco_test.py which can run on a
collection of trace files. The script test/run_regression_tests.sh is
responsible for pulling zip files containing the positive (falco should
detect) and negative (falco should not detect) trace files, creating a
Avocado multiplex file that defines all the tests (one for each trace
file), running avocado on all the trace files, and showing full logs for
any test that didn't pass.
The old regression script, which simply ran falco, has been removed.
Modify falco's stats output to show the total number of events detected
for use in the tests.
In travis.yml, pull a known stable version of avocado and build it,
including installing any dependencies, as a part of the build process.
