This does not directly affect network because network has its own
solution for dealing with testing/linting module_utils code, but
it gets network to feature/code parity with the template and
other repos.
Defines a shell function in utils.sh - lsr_setup_module_utils -
that allows configuring a tox venv installed ansible to have
the repo module_utils code in the default pythonpath for the
venv, which allows testing and linting the module_utils code
without having to otherwise munge or mock the pythonpath.
Projects needing this functionality can set in `.travis/config.sh`
the variable `RUN_PYTEST_SETUP_MODULE_UTILS` to setup
module_utils/ for pytest, and `RUN_PYLINT_SETUP_MODULE_UTILS`
to setup module_utils/ for pylint.
