Cleanup Snappy

Motivation:

314d59b did introduce some static fields that are not used.

Modifications:

Cleanup unused fields / imports

Result:

Cleanup

codec/src/main/java/io/netty/handler/codec/compression/Snappy.java

@@ -19,11 +19,8 @@
 import io.netty.util.concurrent.FastThreadLocal;
 import io.netty.util.internal.MathUtil;
 import io.netty.util.internal.SystemPropertyUtil;
-import io.netty.util.internal.logging.InternalLogger;
-import io.netty.util.internal.logging.InternalLoggerFactory;
 
 import java.util.Arrays;
-import java.util.Locale;
 
 /**
  * Uncompresses an input {@link ByteBuf} encoded with Snappy compression into an
@@ -33,8 +30,6 @@
  */
 public final class Snappy {
 
-    private static final InternalLogger logger = InternalLoggerFactory.getInstance(Snappy.class);
-
     private static final int MAX_HT_SIZE = 1 << 14;
     private static final int MIN_COMPRESSIBLE_BYTES = 15;