Solve the scala compilation warnings after upgrading to scala 2.10.0

[WARNING] /Users/g/Go/test/infinispan.git/server/core/src/main/scala/org/infinispan/server/core/AbstractProtocolDecoder.scala:176: warning: non-variable type argument org.jboss.netty.buffer.ChannelBuffer in type pattern List[org.jboss.netty.buffer.ChannelBuffer] is unchecked since it is eliminated by erasure
[INFO]                case l: List[ChannelBuffer] => l.foreach(ch.write(_))
[INFO]

[WARNING] /Users/g/Go/test/infinispan.git/server/hotrod/src/test/scala/org/infinispan/server/hotrod/HotRodStatsTest.scala:48: warning: Option[String] and Int are unrelated: they will most likely always compare unequal
[INFO]       assertTrue(s.get("timeSinceStart") != 0)
[INFO]                                          ^
[WARNING] /Users/g/Go/test/infinispan.git/server/hotrod/src/test/scala/org/infinispan/server/hotrod/HotRodStatsTest.scala:69: warning: Option[String] and Int are unrelated: they will most likely always compare unequal
[INFO]       assertTrue(s.get("totalBytesRead") != 0)
[INFO]                                          ^
[WARNING] /Users/g/Go/test/infinispan.git/server/hotrod/src/test/scala/org/infinispan/server/hotrod/HotRodStatsTest.scala:70: warning: Option[String] and Int are unrelated: they will most likely always compare unequal
[INFO]       assertTrue(s.get("totalBytesWritten") != 0)
[INFO]  

[WARNING] /Users/g/Go/test/infinispan.git/server/memcached/src/test/scala/org/infinispan/server/memcached/test/MemcachedTestingUtil.scala:92: warning: a pure expression does nothing in statement position; you may be omitting necessary parentheses
[INFO]             null
[INFO]      

[WARNING] /Users/g/Go/test/infinispan.git/server/rest/src/main/scala/org/infinispan/rest/Server.scala:88: warning: unreachable code
[INFO]             case _ => throw new Exception
[INFO]