[TACHYON-69] Removed local check in readRemoteByteBuffer

Removed the local check in the call since the caller of the method is doing the check.  This fixes the tests so the NPE no longer happens.
Instead of removing the check for localhost we could just move it here to log warning. I think we could keep log info the incoming request and only log warning for attempt to go to localhost.

```java
LOG.info(host + ":" + port + " current host is " InetAddress.getLocalHost().getHostName() + " "
              + InetAddress.getLocalHost().getHostAddress());

 if (host.equals(InetAddress.getLocalHost().getHostName())
     || host.equals(InetAddress.getLocalHost().getHostAddress())) {
       String localFileName = CommonUtils.concat(TFS.getRootFolder(), FID);
       LOG.warn("Master thinks the local machine has data " + localFileName + "! But not!");
 }
 
try {
     buf =
          retrieveByteBufferFromRemoteMachine(new InetSocketAddress(host, port),
              blockInfo.blockId);
     if (buf != null) {
        break;
     }
 } catch (IOException e) {
    LOG.error(e);
    buf = null;
 }

```