[code-reflection] Integrated: Finalize switch to using hat subdir insteaf of bldr subdir

[Gary Frost]

Finalized move to using hat subdir for scripts rather than bldr subdir

-------------

Commit messages:
 - Finalize switch to using hat subdir insteaf of bldr subdir

Changes: https://git.openjdk.org/babylon/pull/361/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=361&range=00
  Stats: 5400 lines in 20 files changed: 12 ins; 5378 del; 10 mod
  Patch: https://git.openjdk.org/babylon/pull/361.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/361/head:pull/361

PR: https://git.openjdk.org/babylon/pull/361