[code-reflection] Integrated: using auto generated poms also a fix for CustomOpTest

[Gary Frost]

As many pom.xml files are similar.  We now autogenerate them (I will check in the code for generating them next), this greatly simplifies maintenance. 

I also found that the CustomOpTest was failing after the transition to jdk.incubator.code so we have that fix

Added bldr/clean and clean, so now we can 


java @bldr/clean 
java @bldr/bld
java @bldr/hatrun opencl heal

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Commit messages:
 - using auto generated poms also a fix for CustomOpTest

Changes: https://git.openjdk.org/babylon/pull/281/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=281&range=00
  Stats: 535 lines in 15 files changed: 158 ins; 207 del; 170 mod
  Patch: https://git.openjdk.org/babylon/pull/281.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/281/head:pull/281

PR: https://git.openjdk.org/babylon/pull/281