[SPARK-17558] Bump Hadoop 2.7 version from 2.7.2 to 2.7.3

## What changes were proposed in this pull request?
This patch bumps the Hadoop version in hadoop-2.7 profile from 2.7.2 to 2.7.3, which was recently released and contained a number of bug fixes.

## How was this patch tested?
The change should be covered by existing tests.

Author: Reynold Xin <rxin@databricks.com>

Closes apache#15115 from rxin/SPARK-17558.

Author: rxin

dev/deps/spark-deps-hadoop-2.7

@@ -59,21 +59,21 @@ gson-2.2.4.jar
 guava-14.0.1.jar
 guice-3.0.jar
 guice-servlet-3.0.jar
-hadoop-annotations-2.7.2.jar
-hadoop-auth-2.7.2.jar
-hadoop-client-2.7.2.jar
-hadoop-common-2.7.2.jar
-hadoop-hdfs-2.7.2.jar
-hadoop-mapreduce-client-app-2.7.2.jar
-hadoop-mapreduce-client-common-2.7.2.jar
-hadoop-mapreduce-client-core-2.7.2.jar
-hadoop-mapreduce-client-jobclient-2.7.2.jar
-hadoop-mapreduce-client-shuffle-2.7.2.jar
-hadoop-yarn-api-2.7.2.jar
-hadoop-yarn-client-2.7.2.jar
-hadoop-yarn-common-2.7.2.jar
-hadoop-yarn-server-common-2.7.2.jar
-hadoop-yarn-server-web-proxy-2.7.2.jar
+hadoop-annotations-2.7.3.jar
+hadoop-auth-2.7.3.jar
+hadoop-client-2.7.3.jar
+hadoop-common-2.7.3.jar
+hadoop-hdfs-2.7.3.jar
+hadoop-mapreduce-client-app-2.7.3.jar
+hadoop-mapreduce-client-common-2.7.3.jar
+hadoop-mapreduce-client-core-2.7.3.jar
+hadoop-mapreduce-client-jobclient-2.7.3.jar
+hadoop-mapreduce-client-shuffle-2.7.3.jar
+hadoop-yarn-api-2.7.3.jar
+hadoop-yarn-client-2.7.3.jar
+hadoop-yarn-common-2.7.3.jar
+hadoop-yarn-server-common-2.7.3.jar
+hadoop-yarn-server-web-proxy-2.7.3.jar
 hk2-api-2.4.0-b34.jar
 hk2-locator-2.4.0-b34.jar
 hk2-utils-2.4.0-b34.jar

pom.xml

@@ -2524,7 +2524,7 @@
     <profile>
       <id>hadoop-2.7</id>
       <properties>
-        <hadoop.version>2.7.2</hadoop.version>
+        <hadoop.version>2.7.3</hadoop.version>
         <jets3t.version>0.9.3</jets3t.version>
         <zookeeper.version>3.4.6</zookeeper.version>
         <curator.version>2.6.0</curator.version>