Relook closing OkHttpConnectionPool in Fabric8 Client.

[davinchia]

Tell us about the problem you're trying to solve

The pool is not closing properly today despite calling the various close functions. The pod remains alive for another 5 mins, which is the default time for reaping idle connections.

We are currently forcing the process to exit via System.exit(0).

Describe the solution you’d like

• The easiest solution is to make the Fabric8 client's idle connection configurable, see allow overriding custom http client properties fabric8io/kubernetes-client#3170
• We can also try to understand why the OkHttpPool is not killing itself.

┆Issue is synchronized with this Asana task by Unito

[jrhizor]

as of https://github.com/fabric8io/kubernetes-client/releases/tag/v5.5.0 this is unblocked