Improve test failure on truncated Draft0 handshake read.

+ If a truncated response occurs, attempt to have the test case produce
  a meaningful response message indicating where/how the truncation
  occured, instead of just a 'read timeout'.

jetty-websocket/src/test/java/org/eclipse/jetty/websocket/helper/SafariD00.java

@@ -128,8 +128,16 @@ public class SafariD00
         Assert.assertThat("Hixie handshake buffer size",hixieHandshake.length,is(16));
 
         LOG.debug("Reading hixie handshake bytes");
-        int readLen = in.read(hixieHandshake,0,hixieHandshake.length);
-        Assert.assertThat("Read hixie handshake bytes",readLen,is(hixieHandshake.length));
+        int bytesRead = 0;
+        while (bytesRead < hixieHandshake.length)
+        {
+            int val = in.read();
+            if (val >= 0)
+            {
+                hixieHandshake[bytesRead++] = (byte)val;
+            }
+        }
+        Assert.assertThat("Read hixie handshake bytes",bytesRead,is(hixieHandshake.length));
     }
 
     public void sendMessage(String... msgs) throws IOException