AMBARI-5197. Ambari Installer: Set up tez.am.env to match mapreduce.admin.user.env.(xiwang)

ambari-server/src/main/resources/stacks/HDP/2.1/services/TEZ/configuration/tez-site.xml

@@ -144,6 +144,15 @@
     </description>
   </property>
 
+  <property>
+    <name>tez.am.env</name>
+    <value>LD_LIBRARY_PATH=/usr/lib/hadoop/lib/native:/usr/lib/hadoop/lib/native/`$JAVA_HOME/bin/java -d32 -version &amp;&gt; /dev/null;if [ $? -eq 0 ]; then echo Linux-i386-32; else echo Linux-amd64-64;fi`</value>
+    <description>
+        Additional execution environment entries for tez. This is not an additive property. You must preserve the original value if
+        you want to have access to native libraries.
+    </description>
+  </property>
+
   <!-- Client Submission timeout value when submitting DAGs to a session -->
   <property>
     <name>tez.session.client.timeout.secs</name>