Workaround nox's install only flag
Workaround nox's install only flag

To get some information from the system, which we then use to choose the
appropriate static requirements file, we need to run some commands,
something that nox will refuse to do if `--install-only` is passed.

We work around it by manually patching the value of
`session._runner.global_config.install_only` for the commands that we
MUST run, and only those and then we set it back to the value it had
before.

For additional information about why we have to do this, please see:
   https://github.com/theacodes/nox/pull/181

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt