[LIVY-715][DOC] The configuration in the template is inconsistent with LivyConf.scala
## What changes were proposed in this pull request?
When I test livy impersonation found that, in livy.conf.template the value of livy.impersonation.enabled is true. So I thought impersonation was enabled by default.
However, impersonation was not turned on when we test. I found that the real configuration in LivyConf. scala is false.
This can mislead users.
## How was this patch tested?
no need
Author: captainzmc <micahzhao@tencent.com>
Closes #261 from captainzmc/apache-livy-master.
diff --git a/conf/livy.conf.template b/conf/livy.conf.template
index de7c248..1fe6047 100644
--- a/conf/livy.conf.template
+++ b/conf/livy.conf.template
@@ -62,7 +62,7 @@
# livy.server.session.state-retain.sec = 600s
# If livy should impersonate the requesting users when creating a new session.
-# livy.impersonation.enabled = true
+# livy.impersonation.enabled = false
# Logs size livy can cache for each session/batch. 0 means don't cache the logs.
# livy.cache-log.size = 200
