Refresh default zoo.cfg from Debian package

For some reason, the default file we included was out of sync with
ubuntu / debian; refresh it.

Change-Id: Ibd694e44b06b9decff436f2a62eab49a69b91ba7
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

templates/etc/zookeeper/zoo.cfg

@@ -1,3 +1,5 @@
+# http://hadoop.apache.org/zookeeper/docs/current/zookeeperAdmin.html
+
 # The number of milliseconds of each tick
 tickTime=2000
 # The number of ticks that the initial
@@ -7,23 +9,43 @@ initLimit=10
 # sending a request and getting an acknowledgement
 syncLimit=5
 # the directory where the snapshot is stored.
-# do not use /tmp for storage, /tmp here is just
-# example sakes.
-dataDir=/var/lib/zookeeper/data
-dataLogDir=/var/lib/zookeeper/log
+dataDir=/var/lib/zookeeper
+# Place the dataLogDir to a separate physical disc for better performance
+# dataLogDir=/disk2/zookeeper
+
 # the port at which the clients will connect
 clientPort=2181
-# the maximum number of client connections.
-# increase this if you need to handle more clients
-#maxClientCnxns=60
-#
-# Be sure to read the maintenance section of the
-# administrator guide before turning on autopurge.
-#
-# http://zookeeper.apache.org/doc/current/zookeeperAdmin.html#sc_maintenance
-#
-# The number of snapshots to retain in dataDir
-#autopurge.snapRetainCount=3
-# Purge task interval in hours
-# Set to "0" to disable auto purge feature
-#autopurge.purgeInterval=1
+
+# specify all zookeeper servers
+# The fist port is used by followers to connect to the leader
+# The second one is used for leader election
+#server.1=zookeeper1:2888:3888
+#server.2=zookeeper2:2888:3888
+#server.3=zookeeper3:2888:3888
+
+
+# To avoid seeks ZooKeeper allocates space in the transaction log file in
+# blocks of preAllocSize kilobytes. The default block size is 64M. One reason
+# for changing the size of the blocks is to reduce the block size if snapshots
+# are taken more often. (Also, see snapCount).
+#preAllocSize=65536
+
+# Clients can submit requests faster than ZooKeeper can process them,
+# especially if there are a lot of clients. To prevent ZooKeeper from running
+# out of memory due to queued requests, ZooKeeper will throttle clients so that
+# there is no more than globalOutstandingLimit outstanding requests in the
+# system. The default limit is 1,000.ZooKeeper logs transactions to a
+# transaction log. After snapCount transactions are written to a log file a
+# snapshot is started and a new transaction log file is started. The default
+# snapCount is 10,000.
+#snapCount=1000
+
+# If this option is defined, requests will be will logged to a trace file named
+# traceFile.year.month.day.
+#traceFile=
+
+# Leader accepts client connections. Default value is "yes". The leader machine
+# coordinates updates. For higher update throughput at thes slight expense of
+# read throughput the leader can be configured to not accept clients and focus
+# on coordination.
+#leaderServes=yes