RFR: 8283289 JFR: Rename CheckPoint

[Erik Gahlin]

Hi,

Could I have a review of a fix that renames "CheckPoint" to "checkpoint". The only visible effect of the change is in the 'jfr summary' command where it now displays "jdk.Checkpoint".  

Testing: jdk/jdk/jfr

Thanks
Erik

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Commit messages:
 - Initial

Changes: https://git.openjdk.java.net/jdk/pull/7847/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7847&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8283289
  Stats: 35 lines in 6 files changed: 0 ins; 0 del; 35 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7847.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7847/head:pull/7847

PR: https://git.openjdk.java.net/jdk/pull/7847