Change default Hadoop version to 2.2.0

This change will make the default Hadoop version used throughought AsterixDB v. 2.2.0. It also introduces
dependencyManagement and parameters in the top-level POM (tlp) for easing the management of this dependency
and other dependencies that are similarly pervasive throughout the code, like commons-io and json.

Change-Id: I51e22edb56717d2100d646d5f41a769881c6c86b
Reviewed-on: http://fulliautomatix.ics.uci.edu:8443/125
Tested-by: Jenkins <jenkins@fulliautomatix.ics.uci.edu>
Reviewed-by: Till Westmann <westmann@gmail.com>
diff --git a/asterix-runtime/pom.xml b/asterix-runtime/pom.xml
index c9ace97..d2e3e00 100644
--- a/asterix-runtime/pom.xml
+++ b/asterix-runtime/pom.xml
@@ -160,8 +160,7 @@
 		</dependency>
 		<dependency>
 			<groupId>org.apache.hadoop</groupId>
-			<artifactId>hadoop-core</artifactId>
-			<version>0.20.2</version>
+			<artifactId>hadoop-client</artifactId>
 			<type>jar</type>
 			<scope>compile</scope>
 		</dependency>