RFR: 8282986: Remove "system" in boot class path names [v2]

[Coleen Phillimore]

> This is a somewhat trivial renaming.  Ran the CDS tests locally.

Coleen Phillimore has updated the pull request incrementally with one additional commit since the last revision:

  Remove additional system in system boot class path.

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9349/files
  - new: https://git.openjdk.org/jdk/pull/9349/files/b1cbaaa4..9752b90a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9349&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9349&range=00-01

  Stats: 8 lines in 4 files changed: 0 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/9349.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9349/head:pull/9349

PR: https://git.openjdk.org/jdk/pull/9349