[code-reflection] Integrated: We are switching to use hat subdir (instead of bldr) for scripts

[Gary Frost]

Previously we used scripts in bldr  subdir for various tasks.  This made sense when it was a bld script ;)  but not so muhc for running, sanity checks etc.  

Now we have switched to using the hat subdir. 

So previously 

java @bldr/sanity
java @bldr/bld
java @bldr/hatrun ffi-opencl life 


Now 

java @hat/sanity
java @hat/bld
java @hat/run ffi-opencl life

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

Commit messages:
 - We are switching to use hat subdir (instead of bldr) for scripts

Changes: https://git.openjdk.org/babylon/pull/360/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=360&range=00
  Stats: 480 lines in 30 files changed: 379 ins; 13 del; 88 mod
  Patch: https://git.openjdk.org/babylon/pull/360.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/360/head:pull/360

PR: https://git.openjdk.org/babylon/pull/360