ZEPPELIN-358 add the environment variable and property. update documentation.

conf/zeppelin-env.sh.template

@@ -25,6 +25,7 @@
 
 # export ZEPPELIN_LOG_DIR        		# Where log files are stored.  PWD by default.
 # export ZEPPELIN_PID_DIR        		# The pid files are stored. /tmp by default.
+# export ZEPPELIN_WAR_TEMPDIR    		# The location of jetty temporary directory.
 # export ZEPPELIN_NOTEBOOK_DIR   		# Where notebook saved
 # export ZEPPELIN_NOTEBOOK_HOMESCREEN		# Id of notebook to be displayed in homescreen. ex) 2A94M5J1Z
 # export ZEPPELIN_NOTEBOOK_HOMESCREEN_HIDE	# hide homescreen notebook from list when this value set to "true". default "false"

conf/zeppelin-site.xml.template

@@ -37,6 +37,12 @@
   <description>Context Path of the Web Application</description>
 </property>
 
+<property>
+  <name>zeppelin.war.tempdir</name>
+  <value>webapps</value>
+  <description>Location of jetty temporary directory</description>
+</property>
+
 <property>
   <name>zeppelin.notebook.dir</name>
   <value>notebook</value>

docs/install/install.md

@@ -145,7 +145,13 @@ Configuration can be done by both environment variable(conf/zeppelin-env.sh) and
     <td>zeppelin.notebook.homescreen.hide</td>
     <td>false</td>
     <td>hide homescreen notebook from list when this value set to "true"</td>
-  </tr>  
+  </tr>
+  <tr>
+    <td>ZEPPELIN_WAR_TEMPDIR</td>
+    <td>zeppelin.war.tempdir</td>
+    <td>webapps</td>
+    <td>The location of jetty temporary directory.</td>
+  </tr>
   <tr>
     <td>ZEPPELIN_NOTEBOOK_DIR</td>
     <td>zeppelin.notebook.dir</td>