RFR: 8374802: java/net/DatagramSocket/SendReceiveMaxSize.java fails on AIX due to small default RCVBUF size [v2]

[Andreas Steiner]

> To avoid the test is hanging due to the too small receive buffer, check the receive buffer can hold the capacity. If not, assert. Like we do already in java/nio/channels/DatagramChannel/SendReceiveMaxSize.java (https://bugs.openjdk.org/browse/JDK-8313873)

Andreas Steiner has updated the pull request incrementally with one additional commit since the last revision:

  update copyright header

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Changes:
  - all: https://git.openjdk.org/jdk/pull/29251/files
  - new: https://git.openjdk.org/jdk/pull/29251/files/0de47bec..6740f6e9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=29251&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29251&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/29251.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/29251/head:pull/29251

PR: https://git.openjdk.org/jdk/pull/29251