Review property precedence in start mechanism

[sbordet]

Jetty version
9.4.x

Description
A $JETTY_BASE/modules/foo.mod with an [ini] section that specifies a property is not overwritten neither by the correspondent $JETTY_BASE/start.d/foo.ini, nor by an explicit command line property.

[gregw]

Are you sure? Properties are well ordered and we even use += and ?= operators that rely on ordering to work.

But to contradict myself, perhaps [ini] sections are intended to be durable, else they would be in a [ini-template] ???

[github-actions]

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[sbordet]

Duplicate of #6017.