RFR: 8209137: Add ability to bind to specific local address to HTTP client [v12]

[Jaikiran Pai]

> This change proposes to implement the enhancement noted in https://bugs.openjdk.java.net/browse/JDK-8209137.
> 
> The change introduces a new API to allow applications to build a `java.net.http.HTTPClient` configured with a specific local address that will be used while creating `Socket`(s) for connections.

Jaikiran Pai 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 26 additional commits since the last revision:

 - Merge latest from master branch
 - Merge latest changes from master branch
 - fix javadoc to mention HttpClient instead of HTTPClient
 - minor - rename variable in test
 - Merge latest from master branch
 - Merge latest from master branch
 - Merge latest from master branch
 - copyright year
 - By default add SocketPermission for java.net.http module to allow binding to non-ephemeral ports if local bind address is configured for HTTPClient
 - Merge latest master branch
 - ... and 16 more: https://git.openjdk.java.net/jdk/compare/a7140142...73010886

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/6690/files
  - new: https://git.openjdk.java.net/jdk/pull/6690/files/11c1c6f2..73010886

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=6690&range=11
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=6690&range=10-11

  Stats: 11241 lines in 256 files changed: 7560 ins; 2393 del; 1288 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6690.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6690/head:pull/6690

PR: https://git.openjdk.java.net/jdk/pull/6690