Integration tests seem flaky

[sixolet]

In a way that doesn't seem to relate to any client code

[maximilien]

Seems like there was an issue with getting Istio from servers. Seems fixed now.

[rhuss]

We have now a new kind of Flake for the E2E when using the new go based workflow. Looks like a timing issue:

Failed to successfully execute 'kn service update hello --env TARGET=kn -n kne2etests': Execution error: stderr: 'Operation cannot be fulfilled on services.serving.knative.dev "hello": the object has been modified; please apply your changes to the latest version and try again
' error: 'exit status 1'FAIL	github.com/knative/client/test/e2e	1.792s

E.g. in #198

[rhuss]

Sorry, overlooked #211 . Let's continue over there ....

[rhuss]

I think it is fixed now. Let's close this issue and reopen or create a new one, if we see another flake.