Merge

http-client-branch: (HttpClient) cleanup before JDK-8196962. Removing a legacy logging for HPACK decoding. The HPACK core provides a more robust one.

http-client-baranch: long lines

http-client-branch: move implementation to jdk.internal.net.http

http-client-branch: more fixes for odd intermittent failures

http-client-branch: remove superflous add-modules from security test

http-client-branch: move to standard package and module name

http-client-branch: update copyright year ranges in prep for file moves

http-client-branch: remove incubating tag

http-client-branch: update public API @since tags

http-client-branch: remove remaining vestiges of MultiSubscriber and minor doc cleanup

http-client-branch: fix race condition and MT-safety in SmokeTest (fix the fix)

http-client-branch: fix race condition and MT-safety in SmokeTest

http-client-branch: added mapping subscriber, miscellaneous bug fixes and change to discard()/replace() subscribers

http-client-branch: 8196848: SplitResponseSSL test failing intermitently (but rarely) with HttpClientImpl shutting down.

http-client-branch: add several private <init> methods

http-client-branch: more remaining impl types to internal

http-client-branch: move LineSubscriberAdapter to internal

http-client-branch: move ResponseSubscribers to internal

http-client-branch: more binding to 0.0.0.0 instead of localhost/127.0.0.1

http-client-branch: move BufferingSubscriber to internal

http-client-branch: remove redundant null check

http-client-branch: HttpHeadersImpl use more efficient entrySet

http-client-branch: use UTF-8 for all convertions to String

http-client-branch: immutable data Flow

http-client-branch: add tests with an HTTP/2 server for custom basic and digest authentication

http-client-branch: merge

http-client-branch: possible null dereference in Exchange

http-client-branch: remove redundant null check in Http1Request

http-client-branch: (WebSocket) merge (2)