Upgrade snappy-java to 1.1.2.6

Patch by Jeff Jirsa; Reviewed by Jason Brown for CASSANDRA-13336

CHANGES.txt

@@ -31,6 +31,7 @@
  * Outbound TCP connections ignore internode authenticator (CASSANDRA-13324)
  * Upgrade junit from 4.6 to 4.12 (CASSANDRA-13360)
  * Cleanup ParentRepairSession after repairs (CASSANDRA-13359)
+ * Upgrade snappy-java to 1.1.2.6 (CASSANDRA-13336)
  * Incremental repair not streaming correct sstables (CASSANDRA-13328)
  * Upgrade the jna version to 4.3.0 (CASSANDRA-13300)
  * Add the currentTimestamp, currentDate, currentTime and currentTimeUUID functions (CASSANDRA-13132)

NEWS.txt

@@ -54,6 +54,7 @@ Upgrading
       any inconsistencies.
     - Config option index_interval has been removed (it was deprecated since 2.0)
     - Deprecated repair JMX APIs are removed.
+    - The version of snappy-java has been upgraded to 1.1.2.6
 
 3.11.0
 ======

build.xml

@@ -358,7 +358,7 @@
         <license name="The Apache Software License, Version 2.0" url="http://www.apache.org/licenses/LICENSE-2.0.txt"/>
         <scm connection="${scm.connection}" developerConnection="${scm.developerConnection}" url="${scm.url}"/>
         <dependencyManagement>
-          <dependency groupId="org.xerial.snappy" artifactId="snappy-java" version="1.1.1.7"/>
+          <dependency groupId="org.xerial.snappy" artifactId="snappy-java" version="1.1.2.6"/>
           <dependency groupId="net.jpountz.lz4" artifactId="lz4" version="1.3.0"/>
           <dependency groupId="com.ning" artifactId="compress-lzf" version="0.8.4"/>
           <dependency groupId="com.google.guava" artifactId="guava" version="18.0"/>