Remove and doc unnecessary overrides (now added by default)

[ignasi35]

related to #1922

[ignasi35]

Despite #1922 being backported to 1.5.x this PR only documents the Migration16.md. Users of 1.5.2+ may remove the setting but are not instructed to do it on the Migration15.md because we only made the value a default in 1.5.2.

[dwijnand]

In #2007 I dropped the suggestion to remove the override of the cluster sharding strategy as I think it's noise that detracts from the more critical information in the guide (e.g. cluster shutdown).

So I suggest the same here (explicitly this time): if the configuration is just redundant but otherwise safe to have, I wouldn't include the detail on removing it.

But I'm interested if anyone disagrees (maybe we can find a compromise).

[ignasi35]

SGTM. Let me try again ;-)

[ignasi35]

Actually, I'll rebase on top of #2007 to simplify future merges (fewer conflicts)

[ignasi35]

Build failed on stalled execution and artifact download

[TimMoore]

@ignasi35 what do you think about removing the bindings from the Maven archetype only in 1.5.x? Less stuff to understand in a new Lagom 1.5 project, and less stuff to clean up when migrating.

They were removed from the giter8 templates in lagom/lagom-java.g8#66 and lagom/lagom-scala.g8#66.

[ignasi35]

@ignasi35 what do you think about removing the bindings from the Maven archetype only in 1.5.x? Less stuff to understand in a new Lagom 1.5 project, and less stuff to clean up when migrating.

Sure! I'm currently rewriting the g8 seeds and was planning on reworking the maven archetype but I only had master in mind. Let's make this happen for 1.5.x too.