RFR: 8146132: Excessive output from make test-image

[Coleen Phillimore]

This change makes native output files be only printed when building with LOG=info, to make the build not have so many pages of output.
Tested with GHA and locally (tbd)

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Commit messages:
 - 8146132: Excessive output from make test-image

Changes: https://git.openjdk.org/jdk/pull/11930/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11930&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8146132
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/11930.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11930/head:pull/11930

PR: https://git.openjdk.org/jdk/pull/11930