7bdf781873
When activating a command virtualenv, it rightfully complains if it isn't already running within an active Mach site - the abstraction has restrictions to act as guardrails around the risky business that is `sys.path` patching. Replace `mozperftest/runner.py`'s ad-hoc `sys.path` initializing with `MachSiteManager`'s `activate()` instead. Removes the calls to `_setup_path()` where the `sys.path` should already be set-up. Differential Revision: https://phabricator.services.mozilla.com/D132503
==== mach ==== Mach (German for *do*) is a generic command dispatcher for the command line. To use mach, you install the mach core (a Python package), create an executable *driver* script (named whatever you want), and write mach commands. When the *driver* is executed, mach dispatches to the requested command handler automatically. To learn more, read the docs in ``docs/``.