RFR: 8254182: remove Utils.tryFindJvmPid/waitForJvmPid

[Igor Ignatyev]

`jdk.test.lib.Utils::tryFindJvmPid` and `waitForJvmPid` methods aren't used and should be removed

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Commit messages:
 - remove Utils.tryFindJvmPid/waitForJvmPid

Changes: https://git.openjdk.java.net/jdk/pull/550/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=550&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254182
  Stats: 57 lines in 1 file changed: 0 ins; 57 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/550.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/550/head:pull/550

PR: https://git.openjdk.java.net/jdk/pull/550