RFR: JDK-8282354 : Remove dependancy of TestHttpServer, HttpTransaction, HttpCallback from open/test/jdk/ tests

[Mahendra Chhipa]

Updated following remaining tests to remove depenedies of TestHttpServer, HttpTransaction, HttpCallback
open/test/jdk/java/net/ProxySelector/LoopbackAddresses.java
open/test/jdk/java/net/ProxySelector/ProxyTest.java
open/test/jdk/java/net/URL/PerConnectionProxy.java
open/test/jdk/java/net/URLConnection/B5052093.java
open/test/jdk/sun/net/www/AuthHeaderTest.java
open/test/jdk/sun/net/www/http/KeepAliveCache/B5045306.java

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Commit messages:
 - JDK-8282354 : Remove dependancy of TestHttpServer, HttpTransaction, HttpCallback from open/test/jdk/ tests
 - Merge branch 'master' into JDK-8282354
 - WIP
 - Merge branch 'master' into httptrans
 - Initial Version

Changes: https://git.openjdk.java.net/jdk/pull/7616/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7616&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282354
  Stats: 1573 lines in 11 files changed: 129 ins; 1346 del; 98 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7616.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7616/head:pull/7616

PR: https://git.openjdk.java.net/jdk/pull/7616