[lworld] RFR: 8377162: [lworld] getResourceAsStream() doesn't work in preview mode for exploded images [v4]

[David Beaumont]

> Allow exploded module readers created for exploded system images to support preview mode.

David Beaumont has updated the pull request incrementally with one additional commit since the last revision:

  Adjust test description and method names

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Changes:
  - all: https://git.openjdk.org/valhalla/pull/2032/files
  - new: https://git.openjdk.org/valhalla/pull/2032/files/66fa6c2c..35e8599a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=2032&range=03
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=2032&range=02-03

  Stats: 6 lines in 1 file changed: 1 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/valhalla/pull/2032.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2032/head:pull/2032

PR: https://git.openjdk.org/valhalla/pull/2032