RFR: 8258658: Print log that metal pipeline is enabled when -Dsun.java2d.metal=True is set

[Ajit Ghaisas]

Added printing name of the rendering pipeline in use (only in verbose mode)

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Commit messages:
 - print name of the pipeline in use

Changes: https://git.openjdk.java.net/lanai/pull/157/files
 Webrev: https://webrevs.openjdk.java.net/?repo=lanai&pr=157&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8258658
  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/lanai/pull/157.diff
  Fetch: git fetch https://git.openjdk.java.net/lanai pull/157/head:pull/157

PR: https://git.openjdk.java.net/lanai/pull/157