Similar to keystone [0], we don't need to carry around these files.
- remove run_tests.sh since it's rarely used and an alternative exists
- remove all the remaining venv related files since nothing uses them
The real value of run_tests.sh over tox is that run_tests.sh enables
running tests against against any virtualenv or Python installation. tox
is just a tool that runs testr commands in a specific virtualenv. testr
can be used directly as a run_tests.sh replacement for running tests in
an arbitrary virtualenv or against any Python installation.
[0] Change: I9d4ef8bf935eb565af1c8d53d1ed71be9a94a975
Change-Id: I3299c754269130482eb96a3b9276f628c72c4365
26bdb0657a