Convert the RMI NewThreadAction class into a couple static methods on RuntimeUtil. Also remove a couple unnecessary qualified exports from java.base to java.rmi.
------------- Commit messages: - 8344461: clean up NewThreadAction Changes: https://git.openjdk.org/jdk/pull/22557/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22557&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8344461 Stats: 239 lines in 9 files changed: 88 ins; 133 del; 18 mod Patch: https://git.openjdk.org/jdk/pull/22557.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/22557/head:pull/22557 PR: https://git.openjdk.org/jdk/pull/22557
