[code-reflection] Integrated: KernelContext now using schema

[Gary Frost]

More uses of schema.  Now KernelContext swapped to use schema.

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Commit messages:
 - KernelContext now using schema

Changes: https://git.openjdk.org/babylon/pull/174/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=174&range=00
  Stats: 153 lines in 3 files changed: 24 ins; 120 del; 9 mod
  Patch: https://git.openjdk.org/babylon/pull/174.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/174/head:pull/174

PR: https://git.openjdk.org/babylon/pull/174