ADR-35 bug fix part2

This version includes the following:

• a clear_proxies() added at the end of the test_ScanConfigure_minimal() valid processing steps.
• reversal of the update to Vcc.py fordisavbling the band Vcc

(These now match master version (merge commit 5103bac9).

I addition:

• updated .make/k8s.mk with increased wait time for 2s to 3s
• added support for pytest parametrization to conftest.py and to the CbfSubarray() test_EndScan() method.
• currently running test_EndScan() with 2 parameter values (one for each of the 2 config json files) does not work (because an obsState check error).
• attempted to add pstSubarry obsState check to test_EndScan() but the check fails; was commented out