AdoptOpenJDK 8 with OpenJ9 should mention AdoptOpenJDK in its version output

[breun]

All AdoptOpenJDK builds for macOS mention “AdoptOpenJDK” in the output of java -version, except for AdoptOpenJDK 8 with OpenJ9:

$ /Library/Java/JavaVirtualMachines/openjdk8-openj9/Contents/Home/bin/java -version
openjdk version "1.8.0_202"
OpenJDK Runtime Environment (build 1.8.0_202-b08)
Eclipse OpenJ9 VM (build openj9-0.12.0, JRE 1.8.0 Mac OS X amd64-64-Bit Compressed References 20190130_136 (JIT enabled, AOT enabled)
OpenJ9   - 04890c300
OMR      - d2f4534b
JCL      - 6501440d7a based on jdk8u202-b08)

Compare for instance with AdoptOpenJDK 11 with OpenJ9:

$ /Library/Java/JavaVirtualMachines/openjdk11-openj9/Contents/Home/bin/java -version
openjdk version "11.0.2" 2019-01-15
OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.2+9)
Eclipse OpenJ9 VM AdoptOpenJDK (build openj9-0.12.0, JRE 11 Mac OS X amd64-64-Bit Compressed References 20190130_114 (JIT enabled, AOT enabled)
OpenJ9   - 04890c300
OMR      - d2f4534b
JCL      - 50b45cd160 based on jdk-11.0.2+8)

[M-Davies]

Just as an update on this, all JDK8/J9 builds do this. E.g:

• https://ci.adoptopenjdk.net/job/build-scripts/job/jobs/job/jdk8u/job/jdk8u-windows-x64-openj9:

  openjdk version "1.8.0_262"
  OpenJDK Runtime Environment (build 1.8.0_262-202005171757-b02)
  Eclipse OpenJ9 VM (build master-2d9d45a87, JRE 1.8.0 Windows Server 2012 R2 amd64-64-Bit Compressed References 20200517_691 (JIT enabled, AOT enabled)
  OpenJ9   - 2d9d45a87
  OMR      - 92e2fea39
  JCL      - 4dcdf539 based on jdk8u262-b02)

• https://ci.adoptopenjdk.net/job/build-scripts/job/jobs/job/jdk8u/job/jdk8u-linux-x64-openj9

  openjdk version "1.8.0_262"
  OpenJDK Runtime Environment (build 1.8.0_262-202005171709-b02)
  Eclipse OpenJ9 VM (build master-2d9d45a87, JRE 1.8.0 Linux amd64-64-Bit Compressed References 20200517_642 (JIT enabled, AOT enabled)
  OpenJ9   - 2d9d45a87
  OMR      - 92e2fea39
  JCL      - 4dcdf539 based on jdk8u262-b02)