CDH-3636. Update flume to use snappy-java-1.0.3.2.

Update Flume to use the same snappy-java version as the rest of
CDH. Doing this by removing the explicit dependency and the exclusion
in Avro so that we pick up Avro's snappy-java dependency.

Reason: Bug
Author: Andrew Bayer
Ref: CDH-3636

flume-core/pom.xml

@@ -267,11 +267,6 @@
       <artifactId>avro</artifactId>
     </dependency>
 
-    <dependency>
-      <groupId>org.xerial.snappy</groupId>
-      <artifactId>snappy-java</artifactId>
-    </dependency>
-
     <dependency>
       <groupId>org.apache.avro</groupId>
       <artifactId>avro-compiler</artifactId>

pom.xml

@@ -554,18 +554,6 @@
         <groupId>org.apache.avro</groupId>
         <artifactId>avro</artifactId>
         <version>1.5.4</version>
-        <exclusions>
-          <exclusion>
-            <groupId>org.xerial.snappy</groupId>
-            <artifactId>snappy-java</artifactId>
-          </exclusion>
-        </exclusions>
-      </dependency>
-
-      <dependency>
-        <groupId>org.xerial.snappy</groupId>
-        <artifactId>snappy-java</artifactId>
-        <version>1.0.3-rc2</version>
       </dependency>
 
       <dependency>