[SPARK-4419] Upgrade snappy-java to 1.1.1.6

This upgrades snappy-java to 1.1.1.6, which includes a patch that improves error messages when attempting to deserialize empty inputs using SnappyInputStream (see xerial/snappy-java#89).

We previously tried up upgrade to 1.1.1.5 in #2911 but reverted that patch after discovering a memory leak in snappy-java.  This should leak have been fixed in 1.1.1.6, though (see xerial/snappy-java#92).

Author: Josh Rosen <[email protected]>

Closes #3287 from JoshRosen/SPARK-4419 and squashes the following commits:

5d6f4cc [Josh Rosen] [SPARK-4419] Upgrade snappy-java to 1.1.1.6.

(cherry picked from commit 7d8e152)
Signed-off-by: Reynold Xin <[email protected]>

Author: JoshRosen

pom.xml

@@ -413,7 +413,7 @@
       <dependency>
         <groupId>org.xerial.snappy</groupId>
         <artifactId>snappy-java</artifactId>
-        <version>1.1.1.3</version>
+        <version>1.1.1.6</version>
       </dependency>
       <dependency>
         <groupId>net.jpountz.lz4</groupId>