Non-timeout network errors are not fatal when an instance is deleted,
for the same reasons given for removing a haproxy instance in the
prior commit.

It is also not fatal if the admin Secret is missing when we remove
a varnish instance, or when setting its config to the NotReady VCL.
Similar to reasons given for haproxy in prior commits -- in such
cases we assume that Secret has been deleted in an undeployment
operation, so its not necessary to set a "not configured" state,
since the instance will be removed imminently.

While here, make sure that dataplane transactions get deleted,
including after errors.

We assume that haproxy has been stopped (and the Pod may have been
deleted).

Go's "permanent network error" is now deprecated, so we limit this
distinction to timeout errors.

We assume that the Service is being deleted, and delete Secret has
already been executed; then it is not necessary to re-configure
the offloader, since it wil be deleted altogether.

Delay for a bit after deployment, to make sure that haproxy
re-configuration/restart is complete before verifying the test.

The test needs haproxy on the path, otherwise it's skipped.

That is, if the varnish controller has stored no instances in its
own data structures.

We try to set the admin Secret prior to the update operation, but
Incomplete or Recoverable errors setting the Secret may be resolved
by the full update. So only fail the update on Fatal errors.

Encapsulate setting the admin Secret for a viking Service in a
common function.

Installed from pkg.uplex.de.

Call helm uninstall with --wait, and where necessary, wait for viking
service pods to be undeployed.

This minimizes errors during the sequential e2e test run -- the
controller may still be working on deletion of the resources of the
previous test when resources of the next test are added.

Did I mention that I have always been bad with packaging stuff?

Really sorry 🙇

This reverts commit 88445180.

debian has 1.2.0-1 and our fix was a67c601b0ca4bb1d605164746a929ec74cdc8ebb

master is not correct when we build a tag - I was getting a build
based on an older image.

https://go.dev/doc/go-get-install-deprecation

The base image is now debian slim 12.2 (bookworm), and haproxy is
version 2.6.12.

This requires seom additional CLI arguments in the dataplaneapi
invocation.