[cetic/nifi] Add support for istio

[dsarosi]

Is your feature request related to a problem? Please describe.
When using istio the node has trouble connecting with the cluster.

2020-12-08 03:19:03,514 ERROR [Curator-Framework-0] o.a.c.f.imps.CuratorFrameworkImpl Background retry gave up org.apache.curator.CuratorConnectionLossException: KeeperErrorCode = ConnectionLoss at org.apache.curator.framework.imps.CuratorFrameworkImpl.performBackgroundOperation(CuratorFrameworkImpl.java:972) at org.apache.curator.framework.imps.CuratorFrameworkImpl.backgroundOperationsLoop(CuratorFrameworkImpl.java:943) at org.apache.curator.framework.imps.CuratorFrameworkImpl.access$300(CuratorFrameworkImpl.java:66) at org.apache.curator.framework.imps.CuratorFrameworkImpl$4.call(CuratorFrameworkImpl.java:346) at java.util.concurrent.FutureTask.run(FutureTask.java:266) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748)

Describe the solution you'd like
It would be nice if the helm chart could support istio.

Describe alternatives you've considered
Disabling the istio sidecar which works fine, but one would lose some trafficking features.

Additional context
Add any other context or screenshots about the feature request here.

[alexnuttinck]

Hello @dsarosi,

Thanks for your Feature request. It is not at the agenda, but we are open to PR.

[bmgante]

Hi,
As workaround, is it only required to disable isto in sts annotations or is it also required to disable isto for registry and zookeeper charts?

[bmgante]

Is there some improvement to support istio?