This issue fixes tests to use the loopback address whenever possible. It also fixes some safe publishing issues, or add diagnostics in some of the tests.

test/jdk/java/net/Authenticator/B4678055.java: fixes safe publishing issues and adds diagnostics
test/jdk/java/net/DatagramSocket/PortUnreachable.java: mark test as intermittent, adds diagnostics
test/jdk/java/net/URLConnection/RedirectLimit.java: adds diagnostics
test/jdk/java/net/URLConnection/Responses.java: adds diagnostics
test/jdk/javax/net/ssl/templates/SSLSocketTemplate.java: adds ability to use the loopback address instead of the wildcard
test/jdk/sun/net/InetAddress/nameservice/simple/DefaultCaching.java: adds diagnostics
test/jdk/sun/net/www/AuthHeaderTest.java: force usage of NO_PROXY
test/jdk/sun/net/www/http/HttpClient/RetryPost.java: adds diagnostics
test/jdk/sun/net/www/protocol/https/HttpsClient/ProxyAuthTest.java: use the loopback address instead of the wildcard
test/jdk/sun/net/www/protocol/https/HttpsClient/ProxyTunnelServer.java: add ability to use loopback address instead of the wildcard
test/jdk/sun/net/www/protocol/https/HttpsURLConnection/B6216082.java: use specific address rather than the wildcard
test/jdk/sun/net/www/protocol/https/HttpsURLConnection/B6226610.java: use specific address rather than the wildcard
test/jdk/sun/net/www/protocol/https/HttpsURLConnection/HttpsProxyStackOverflow.java: use the loopback address instead of the wildcard
test/jdk/sun/net/www/protocol/https/HttpsURLConnection/TunnelProxy.java: add ability to use loopback address instead of the wildcard
test/jdk/com/sun/net/httpserver/bugs/8199849/BasicAuthenticatorCharset.java: use the loopback address instead of the wildcard