RFR: 8318447: Move NMT source code to own subdirectory [v2]

[Johan Sjölen]

> I think that NMT is deserving of its own subdirectory. Can we do a review of the changes before I fix the merge conflicts?
> 
> 1. Moved all the nmt source code from services/ to nmt/
> 2. Renamed all the include statements and sorted them
> 3. Fixed the include guards

Johan Sjölen has updated the pull request incrementally with one additional commit since the last revision:

  Fixed reviewed changes

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/16276/files
  - new: https://git.openjdk.org/jdk/pull/16276/files/2fd7c355..08e6f4bf

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16276&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16276&range=00-01

  Stats: 43 lines in 15 files changed: 19 ins; 15 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/16276.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16276/head:pull/16276

PR: https://git.openjdk.org/jdk/pull/16276