RFR: 8332623: Remove setTTL()/getTTL() methods from DatagramSocketImpl/MulticastSocket and MulticastSocket.send(DatagramPacket, byte) [v2]

[Jaikiran Pai]

> Can I please get a review of this change which proposes to remove the deprecated-for-removal methods from `MulticastSocket` and `DatagramSocketImpl`? 
> 
> The following methods on `java.net.MulticastSocket` and `java.net.DatagramSocketImpl`:
> 
> 
> public void setTTL(byte ttl) throws IOException
> public byte getTTL() throws IOException
> 
> 
> and this other one on `MulticastSocket`:
> 
> 
> public void send(DatagramPacket p, byte ttl) throws IOException 
> 
> 
> have been deprecated for removal since Java 23, through https://bugs.openjdk.org/browse/JDK-8332181. Even before that they have been deprecated since Java 1.2 and Java 1.4.
> 
> The commit in this PR removes them completely. This PR also removes some tests that were specifically testing the `setTTL()/getTTL()/send(DatagramPacket, byte)` methods. A few other tests have been adjusted to use the alternate `getTimeToLive()/setTimeToLive()` methods where appropriate.
> 
> Existing tests in tier1, tier2 and tier3 continue to pass with these changes.

Jaikiran Pai has updated the pull request incrementally with three additional commits since the last revision:

 - no need to setTimeToLive() in AdaptorMulticasting test
 - undo change to "@summary" of a test
 - remove sendLock

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/25744/files
  - new: https://git.openjdk.org/jdk/pull/25744/files/934d3357..c0017d07

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25744&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25744&range=00-01

  Stats: 31 lines in 3 files changed: 0 ins; 26 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/25744.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25744/head:pull/25744

PR: https://git.openjdk.org/jdk/pull/25744