[jdk11u-dev] RFR: 8266250: WebSocketTest and WebSocketProxyTest call assertEquals(List<byte[]>, List<byte[]>)

[George Adams]

Backport required to bump JDK11u to jtreg 6

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

Commit messages:
 - Backport 01415f33e34621294832c165f21b112ed1c54103

Changes: https://git.openjdk.org/jdk11u-dev/pull/1253/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1253&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8266250
  Stats: 66 lines in 2 files changed: 62 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1253.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev pull/1253/head:pull/1253

PR: https://git.openjdk.org/jdk11u-dev/pull/1253