ZOOKEEPER-3122: add missing pom to source tarball

Author: Norbert Kalmar <nkalmar@yahoo.com>

Reviewers: andor@apache.org

Closes #900 from nkalmar/master

(cherry picked from commit 915c6acaea3f5c01d26f0bff93d1897a4da3e32c)
Signed-off-by: Andor Molnar <andor@apache.org>
diff --git a/zookeeper-assembly/src/main/assembly/source-package.xml b/zookeeper-assembly/src/main/assembly/source-package.xml
index 9a0f2a9..f93b4c6 100644
--- a/zookeeper-assembly/src/main/assembly/source-package.xml
+++ b/zookeeper-assembly/src/main/assembly/source-package.xml
@@ -106,6 +106,7 @@
       <directory>${project.basedir}/..</directory>
       <outputDirectory>.</outputDirectory>
       <includes>
+        <include>pom.xml</include>
         <include>build.xml</include>
         <include>ivy.xml</include>
         <include>ivysettings.xml</include>