Issue #1569 - relaxing WebSocketPolicy.setMax*MessageSize checks

+ Allow setting of the max (binary|text) message size to -1 to
  have unconstrained message sizes.
+ Disconnect message size from buffer size in JSR356 Session calls

jetty-websocket/javax-websocket-client-impl/src/main/java/org/eclipse/jetty/websocket/jsr356/JsrSession.java

@@ -328,7 +328,6 @@ public class JsrSession extends WebSocketSession implements javax.websocket.Sess
     @Override
     public void setMaxBinaryMessageBufferSize(int length)
     {
-        getPolicy().setMaxBinaryMessageSize(length);
         getPolicy().setMaxBinaryMessageBufferSize(length);
     }
 
@@ -342,7 +341,6 @@ public class JsrSession extends WebSocketSession implements javax.websocket.Sess
     @Override
     public void setMaxTextMessageBufferSize(int length)
     {
-        getPolicy().setMaxTextMessageSize(length);
         getPolicy().setMaxTextMessageBufferSize(length);
     }
 

jetty-websocket/websocket-api/src/main/java/org/eclipse/jetty/websocket/api/WebSocketPolicy.java

@@ -273,9 +273,6 @@ public class WebSocketPolicy
     public void setInputBufferSize(int size)
     {
         assertGreaterThan("InputBufferSize",size,1);
-        assertLessThan("InputBufferSize",size,"MaxTextMessageBufferSize",maxTextMessageBufferSize);
-        assertLessThan("InputBufferSize",size,"MaxBinaryMessageBufferSize",maxBinaryMessageBufferSize);
-
         this.inputBufferSize = size;
     }
 
@@ -304,7 +301,7 @@ public class WebSocketPolicy
      */
     public void setMaxBinaryMessageSize(int size)
     {
-        assertGreaterThan("MaxBinaryMessageSize",size,1);
+        assertGreaterThan("MaxBinaryMessageSize",size,-1);
 
         this.maxBinaryMessageSize = size;
     }
@@ -334,7 +331,7 @@ public class WebSocketPolicy
      */
     public void setMaxTextMessageSize(int size)
     {
-        assertGreaterThan("MaxTextMessageSize",size,1);
+        assertGreaterThan("MaxTextMessageSize",size,-1);
 
         this.maxTextMessageSize = size;
     }