Unit tests currently fail

[pzakha]

We have disable unit tests as part of #1 to be able to build BCC.

The issue is that the python tests do not setup PYTHONPATH properly and so the tests cannot find bcc:

 5/37 Test  #5: py_test_bpf_log ..................***Failed    0.02 sec
Traceback (most recent call last):
  File "/home/ubuntu/linux-pkg/packages/bcc/tmp/repo/tests/python/test_bpf_log.py", line 5, in <module>
    from bcc import BPF
ImportError: No module named bcc
Failed

Changing PYTHONPATH in bcc/tests/wrapper.sh.in

- PYTHONPATH=@CMAKE_BINARY_DIR@/src/python
+ PYTHONPATH=@CMAKE_BINARY_DIR@/src/python/bcc-python3

seems to fix that issue. This discrepancy may be coming from how dpkg_buildpkg creates a bcc-python2 directory for python2 packages and a bcc-python3 directory for python3 packages.
Even after this change there are still 2 tests that are failing:

• py_test_free_bcc_memory
• lua_test_standalone

Unit tests also added 7 minutes to the build time in my run, and since we aren't currently doing any changes to bcc I think we can leave them disabled.

I'm leaving this issue opened for future references.