RFR: 8266250: WebSocketTest and WebSocketProxyTest call assertEquals(List<byte[]>, List<byte[]>) [v2]

[Daniel Fuchs]

> Please find here an almost trivial test fix that should improve diagnostic in case of failures. 
> It also avoids relying on an unspecified behavior of `Assert.assertEquals`.

Daniel Fuchs has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:

 - Merge branch 'master' into websocket
 - Updated Copyright years...
 - 8266250: WebSocketTest and WebSocketProxyTest call assertEquals(List<byte[]>, List<byte[]>)

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3776/files
  - new: https://git.openjdk.java.net/jdk/pull/3776/files/be895b9d..ce9750e5

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3776&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3776&range=00-01

  Stats: 1008 lines in 38 files changed: 840 ins; 103 del; 65 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3776.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3776/head:pull/3776

PR: https://git.openjdk.java.net/jdk/pull/3776