Baseline Testing: Zero downtime NKG upgrades

[mpstefan]

As a user of NKG
I want NKG to test to make sure that the upgrade from the previous version of NKG to the next version of NKG does not incur "downtime" to my application
So that I can upgrade my installation of NKG with confidence.

Acceptance

• A test process is documented to test for downtime during an NKG upgrade from the previous version of NKG to the latest.
• A prolonged connection is tested during the NKG upgrade.
• No element of the test is randomized.
• The amount of traffic that is dropped or results in an unexpected error is shown as the result of the test.
• The test is carried out manually and the results are reported in a static document within the NKG repo.

[mpstefan]

@pleshakov to reveal his prolonged connection magic

[mpstefan]

Blocked by #542