ZOOKEEPER-3022: MAVEN MIGRATION - Iteration 1 - docs, it

First iteration of the directory changes in maven migration.
This time, the empty zookeeper-it for future integration tests were created, and the docs source were moved to zookeeper-docs.
Tested with forest v0.9, documents generations were successful with ant.

Author: Norbert Kalmar <nkalmar@yahoo.com>

Reviewers: Andor Molnar <andor@apache.org>

Closes #550 from nkalmar/ZOOKEEPER-3022-1

build.xml

@@ -140,7 +140,7 @@ xmlns:cs="antlib:com.puppycrawl.tools.checkstyle.ant">
     <property name="test.quick" value="no" />
     <property name="conf.dir" value="${basedir}/conf"/>
     <property name="docs.dir" value="${basedir}/docs"/>
-    <property name="docs.src" value="${basedir}/src/docs"/>
+    <property name="docs.src" value="${basedir}/zookeeper-docs"/>
     <property name="javadoc.link.java"
               value="http://docs.oracle.com/javase/6/docs/api/" />
     <property name="javadoc.packages" value="org.apache.*" />