holder task for set of subtasks which will modify various network tests for Ipv6 only test runs

this will involve adding additional diagnostics, create separate test i.e. converting @run to @test , adding additional tests with -Djava.net.PreferIPv6Addresses set

jtreg -l open/test/jdk/:jdk_ipv6_only gives us a list of tests which require some amendment with additional diagnostics and
the separation of @run into dedicated @Test statements.
The diagnostics is to add a IPSupport.printPlatformSupport(System.out); to the test. This will assist when analysing test failures in IPv6 only environments to correlate what the JDK runtime perceives as the test network env and what has been configure in the test env setup.

The second part of the enhancement is to separate out the @run commands in the test into individual @Test commands
and to add a specific @Test with an @run specifying the system property -Djava.net.PreferIPv6Addresses=true
The main reason for separating the @run commands is to ensure that all tests are executed in an IPv6 test environment, so that we can determine the full extend of JDK networking behaviour in IPv6 only environments.


This task will have a number of subtasks as per the file list attached, with one subtask per test directory

NIO NETWORKCHANNEL:

java/nio/channels
java/nio/channels/AsynchronousServerSocketChannel
java/nio/channels/AsynchronousSocketChannel
java/nio/channels/DatagramChannel
java/nio/channels/etc
java/nio/channels/Selector/DeferredClose
java/nio/channels/Selector
java/nio/channels/ServerSocketChannel
java/nio/channels/SocketChannel


JAVA NET:

java/net
java/net/whitebox
java/net/vthread
java/net/URLStreamHandler
java/net/URLPermission/nstest
java/net/URLPermission
java/net/URLDecoder
java/net/URLConnection/6212146
java/net/URLConnection/contentHandler
java/net/URLConnection/ContentHandlers
java/net/URLConnection
java/net/URLClassLoader/closetest
java/net/URLClassLoader/definePackage
java/net/URLClassLoader/getresourceasstream
java/net/URLClassLoader/sealing
java/net/URLClassLoader/closetest
java/net/URLClassLoader
java/net/URL
java/net/URI

java/net/Authenticator
java/net/BindException
java/net/CookieHandler
java/net/DatagramPacket
java/net/DatagramSocket
java/net/DatagramSocketImpl

java/net/httpclient/altsvc
java/net/httpclient/examples
java/net/httpclient/http2
java/net/httpclient/http3
java/net/httpclient/HttpRequestBodyPublishers
java/net/httpclient/offline
java/net/httpclient/PathSubscriber
java/net/httpclient/qpack
java/net/httpclient/quic/tls
java/net/httpclient/quic
java/net/httpclient/security/filePerms/
java/net/httpclient/ssltest
java/net/httpclient/websocket/security
java/net/httpclient/websocket
java/net/httpclient/whitebox/
java/net/httpclient

java/net/HttpCookie/whitebox
java/net/HttpCookie
java/net/HttpURLConnection
java/net/HttpURLConnection/SetAuthenticator
java/net/IDN

java/net/Inet4Address
java/net/Inet6Address/serialize
java/net/Inet6Address
java/net/InetAddress/ptr
java/net/InetAddress
java/net/InetSocketAddress
java/net/InterfaceAddress

java/net/ipv6tests
java/net/JarURLConnection
java/net/MulticastSocket
java/net/NetworkInterface
java/net/PlainSocketImpl
java/net/PortUnreachableException
java/net/ProxySelector
java/net/ResponseCache

java/net/ServerSocket
java/net/Socket/asyncClose
java/net/Socket/setReuseAddress
java/net/Socket

java/net/SocketException
java/net/SocketImpl
java/net/SocketInputStream
java/net/SocketOption
java/net/SocketPermission
java/net/Socks

java/net/spi/InetAddressResolverProvider/serviceProviderOriginType
java/net/spi/InetAddressResolverProvider
java/net/spi/URLStreamHandlerProvider
java/net/UnixDomainSocketAddress

jdk/net/ExtendedSocketOption
jdk/net/Sockets

com/sun/net/httpserver
com/sun/net/httpserver/simpleserver

sun/net/ext/
sun/net/ftp
sun/net/idn
sun/net/InetAddress/nameservice/dns/
sun/net/InetAddress/nameservice/simple
sun/net/spi
sun/net/util
sun/net/www/http/ChunkedInputStream
sun/net/www/http/HttpClient
sun/net/www/http/HttpURLConnection
sun/net/www/http/KeepAliveCache
sun/net/www/http/KeepAliveStream
sun/net/www/http/KeepAliveStreamCleaner
sun/net/www/http/RequestMethodCheck
sun/net/www/protocol/file
sun/net/www/protocol/http
sun/net/www/protocol/https/HttpsClient
sun/net/www/protocol/https/HttpsURLConnection
sun/net/www/protocol/https/NewImpl
sun/net/www/protocol/https
sun/net/www/protocol/jar/jarbug
sun/net/www/protocol/jar
sun/net/www/protocol/jrt
sun/net/www/protocol/mailto
sun/net/www
sun/net/