Separate Travis builds for caffe/torch/deb

[lukeyeager]

• Updated the test suite to check for the envvar DIGITS_TEST_FRAMEWORK (caffe, torch or none)
  • This could be useful for every-day testing - not just on Eris
  • The hacks I had to add for dealing with inheritance properly are pretty gnarly
• Test deb package build on Travis (preparing for automatic PPA uploads)

[lukeyeager]

One big positive of this approach is that it's clear when the tests are failing because of Torch (which is usually the case).

[ERROR] torch classify many task failed with error code -11

Looks like Torch is segfaulting!? That's a new one.

[lukeyeager]

Looks like Torch is segfaulting!? That's a new one.

Re-ran the build and it passed.

[jmancewicz]

There's a bit code that looks repeated and could maybe become classes and function that are imported.
Could the mixins be imported?
Could this be a function?
if 'DIGITS_TEST_FRAMEWORK' in os.environ and os.environ['DIGITS_TEST_FRAMEWORK'] != 'none': raise unittest.SkipTest('Non-framework tests skipped')

[lukeyeager]

Thanks for the feedback Joe. I've refactored some code into a new file: digits/test_utils.py.

[lukeyeager]

When the builds are cached everything finishes in 10 minutes now! 🎉
https://travis-ci.org/NVIDIA/DIGITS/builds/165384804