RFR: 8257424: Add setName() to RecordingStream

Mon Nov 30 22:40:15 UTC 2020

`RecordingStream` will start new flight recording to gather events. It has some of methods which are equivalent to `Recording`, but we cannot set recording name.

If we can specify the name for `RecordingStream`, it is useful to distinguish recordings by JFR.check dcmd.

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Commit messages:
 - 8257424: Add setName() to RecordingStream

Changes: https://git.openjdk.java.net/jdk/pull/1520/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1520&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257424
  Stats: 71 lines in 2 files changed: 71 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1520.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1520/head:pull/1520

PR: https://git.openjdk.java.net/jdk/pull/1520