RFR: 8332623: Remove setTTL()/getTTL() methods from DatagramSocketImpl/MulticastSocket and MulticastSocket.send(DatagramPacket, byte)

[Lei Zhu]

Remove setTTL()/getTTL() methods from DatagramSocketImpl/MulticastSocket and MulticastSocket.send(DatagramPacket, byte)

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Commit messages:
 - Remove setTTL()/getTTL() methods from DatagramSocketImpl/MulticastSocket and MulticastSocket.send(DatagramPacket, byte)

Changes: https://git.openjdk.org/jdk/pull/19404/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19404&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332623
  Stats: 227 lines in 4 files changed: 0 ins; 227 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19404.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19404/head:pull/19404

PR: https://git.openjdk.org/jdk/pull/19404