Using pytest-xvfb fixes the original crash (which was happening in config_test.py), but introduces a new test failure:

def test_root_locus_zoom(self):
[102](https://github.com/murrayrm/python-control/runs/7679958935?check_suite_focus=true#step:5:103)
        """Check the zooming functionality of the Root locus plot"""
[103](https://github.com/murrayrm/python-control/runs/7679958935?check_suite_focus=true#step:5:104)
        system = TransferFunction([1000], [1, 25, 100, 0])
[104](https://github.com/murrayrm/python-control/runs/7679958935?check_suite_focus=true#step:5:105)
        plt.figure()
[105](https://github.com/murrayrm/python-control/runs/7679958935?check_suite_focus=true#step:5:106)
        root_locus(system)
[106](https://github.com/murrayrm/python-control/runs/7679958935?check_suite_focus=true#step:5:107)
        fig = plt.gcf()
[107](https://github.com/murrayrm/python-control/runs/7679958935?check_suite_focus=true#step:5:108)
        ax_rlocus = fig.axes[0]
[108](https://github.com/murrayrm/python-control/runs/7679958935?check_suite_focus=true#step:5:109)
    
[109](https://github.com/murrayrm/python-control/runs/7679958935?check_suite_focus=true#step:5:110)
        event = type('test', (object,), {'xdata': 14.7607954359,
[110](https://github.com/murrayrm/python-control/runs/7679958935?check_suite_focus=true#step:5:111)
                                         'ydata': -35.6171379864,
[111](https://github.com/murrayrm/python-control/runs/7679958935?check_suite_focus=true#step:5:112)
                                         'inaxes': ax_rlocus.axes})()
[112](https://github.com/murrayrm/python-control/runs/7679958935?check_suite_focus=true#step:5:113)
        ax_rlocus.set_xlim((-10.813628105112421, 14.760795435937652))
[113](https://github.com/murrayrm/python-control/runs/7679958935?check_suite_focus=true#step:5:114)
        ax_rlocus.set_ylim((-35.61713798641108, 33.879716621220311))
[114](https://github.com/murrayrm/python-control/runs/7679958935?check_suite_focus=true#step:5:115)
>       plt.get_current_fig_manager().toolbar.mode = 'zoom rect'
[115](https://github.com/murrayrm/python-control/runs/7679958935?check_suite_focus=true#step:5:116)
E       AttributeError: 'NoneType' object has no attribute 'mode'

There is a note saying that we were using xvfb-run to get the right MPL back end, so that is probably related somehow.

CI tests are failing (xvfb issue?) #756

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