Improve system test framework reliability
Improve system test framework reliability

The chromedriver occasionally calls out with its own API,
which isn't part of the system under test. This can occasionally
cause an error of this form:
An HTTP request has been made that VCR does not know how to handle:
GET https://chromedriver.storage.googleapis.com/LATEST_RELEASE_87.0.4280

This commit fixes the problem.

Signed-off-by: David A. Wheeler <9ae72d22d8b894b865a7a496af4fab6320e6abb2@dwheeler.com>

coreinfrastructure/best-practices-badge,linuxfoundation/cii-best-practices-badge,coreinfrastructure/best-practices-badge,linuxfoundation/cii-best-practices-badge,linuxfoundation/cii-best-practices-badge,coreinfrastructure/best-practices-badge,coreinfrastructure/best-practices-badge,linuxfoundation/cii-best-practices-badge