NEXUS-5447 clear interrupted flag in InterruptableInputStream

The wrapper both aborts underlying http request and throws
InterruptedIOException. Leaving Thread interrupted flag on may
trigger unnecessary/unwanted isInterrupted detection in
unrelated code executed by the thread later on.

Signed-off-by: Igor Fedorenko <igor@ifedorenko.com>

nexus/nexus-proxy/src/main/java/org/sonatype/nexus/proxy/storage/remote/httpclient/InterruptableInputStream.java

@@ -45,8 +45,7 @@ public InterruptableInputStream( final InputStream stream )
     private void abortIfInterrupted()
         throws IOException
     {
-        final Thread thread = Thread.currentThread();
-        if ( thread.isInterrupted() )
+        if ( Thread.interrupted() )
         {
             if ( request != null )
             {