hg: jdk/submit: 8221473: Configuration::reads can use Set.copyOf

[claes.redestad at oracle.com]

Changeset: 33f0b34c9dd7
Author:    redestad
Date:      2019-03-26 15:20 +0100
URL:       http://hg.openjdk.java.net/jdk/submit/rev/33f0b34c9dd7

8221473: Configuration::reads can use Set.copyOf
Reviewed-by: alanb, forax

! src/java.base/share/classes/java/lang/module/Configuration.java