RFR: 8303016: Invalid escapes in grep patterns

[Mikael Vidstedt]

In a few grep patterns characters are escaped when they shouldn't be. Some grep versions seem to ignore this, but Cygwin grep generates a warning:

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

Commit messages:
 - Update copyright years
 - Remove unnecessary escape in grep patterns

Changes: https://git.openjdk.org/jdk/pull/12695/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12695&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303016
  Stats: 5 lines in 3 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/12695.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12695/head:pull/12695

PR: https://git.openjdk.org/jdk/pull/12695