[code-reflection] Integrated: Job builder was dropping javac jvmopts

[Gary Frost]

env.bash was pointing to exploded image rather than image. 

We also had a job bldr bug. 

job bldr  was collecting the javac opts but then sadly discarding them .

So when pointing to exploded image this was fine., but when we pointed to the images/jdk we failed to compile code using jdk.incubator.code becuase we had dropped --modules=jdk.incudbator.code option

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Commit messages:
 - Job builder was dropping javac jvmopts

Changes: https://git.openjdk.org/babylon/pull/727/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=727&range=00
  Stats: 18 lines in 3 files changed: 5 ins; 8 del; 5 mod
  Patch: https://git.openjdk.org/babylon/pull/727.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/727/head:pull/727

PR: https://git.openjdk.org/babylon/pull/727