At the moment for some scenarios, like linters, where ansible bootstrap
is skipped, PIP_OPTS are undefined and linters fail due to that.
With patch we define PIP_OPTS to an empty value if
we're not in CI.
Alternatively we can patch scenarios independently
not to rely on existance of PIP_OPTS or export default in
gate-check-commit instead.
Change-Id: If451b4bc12bb0b0bfe3fe20494e99a07b59ab798
d458b1f46a