Create Source tarball using Default ASF Configuration (apache#9184)

With this patch we are now using the common ASF configuration to create the "release tarball" to be VOTEd and release during the official VOTE.

Currently in 2.6+ we are 

Changes:
- Use ASF apache-source-release-assembly-descriptor
- Configure the final name of the artifact
- Update the release script src/stage-release.sh used during the release process https://github.com/apache/pulsar/wiki/Release-process
- Remove the old "src" descriptor 

Results:
With this change you will find the apache-pulsar-VERSION-src.tar.gz file inside the main "target" directory.
It contains the dump of the source tree, according to the default Apache rules (basically it strips out only the GIT releated files).

The source tarball that we are going to release and VOTE will be a copy of the git tag from which it has been created

Notes:
in ASF projects usually you are using the -Papache-release profile but it looks like we are not using it always here https://github.com/apache/pulsar/wiki/Release-process

it would be better to activate this package only with a Maven profile, in order to speed up the build when you are not performing a release.

distribution/server/pom.xml

@@ -259,7 +259,6 @@
               <finalName>apache-pulsar-${project.version}</finalName>
               <descriptors>
                 <descriptor>src/assemble/bin.xml</descriptor>
-                <descriptor>src/assemble/src.xml</descriptor>
               </descriptors>
             </configuration>
           </execution>

pom.xml

@@ -1348,6 +1348,40 @@ flexible messaging model and an intuitive client API.</description>
             </execution>
         </executions>
       </plugin>
+      <plugin>
+          <groupId>org.apache.maven.plugins</groupId>
+          <artifactId>maven-assembly-plugin</artifactId>
+          <version>${maven-assembly-plugin.version}</version>
+          <dependencies>
+              <dependency>
+                  <groupId>org.apache.apache.resources</groupId>
+                  <artifactId>apache-source-release-assembly-descriptor</artifactId>
+                  <version>1.0.6</version>
+              </dependency>
+          </dependencies>
+          <executions>
+              <execution>
+                  <id>source-release-assembly-tar-gz</id>
+                  <phase>generate-sources</phase>
+                  <goals>
+                      <goal>single</goal>
+                  </goals>
+                  <configuration>
+                      <runOnlyAtExecutionRoot>true</runOnlyAtExecutionRoot>
+                      <descriptorRefs>
+                          <!-- defined in Apache Parent Pom -->
+                          <descriptorRef>${sourceReleaseAssemblyDescriptor}</descriptorRef>
+                      </descriptorRefs>
+                      <finalName>apache-pulsar-${project.version}-src</finalName>
+                      <appendAssemblyId>false</appendAssemblyId>
+                      <formats>
+                          <format>tar.gz</format>
+                      </formats>
+                      <tarLongFileMode>posix</tarLongFileMode>
+                  </configuration>
+              </execution>
+          </executions>
+      </plugin>
     </plugins>
 
     <pluginManagement>

pulsar-client-cpp/pkg/deb/build-deb.sh

@@ -28,13 +28,13 @@ POM_VERSION=`$SRC_ROOT_DIR/src/get-project-version.py`
 # Sanitize VERSION by removing `SNAPSHOT` if any since it's not legal in DEB
 VERSION=`echo $POM_VERSION | awk -F-  '{print $1}'`
 
-ROOT_DIR=apache-pulsar-$POM_VERSION
+ROOT_DIR=apache-pulsar-$POM_VERSION-src
 CPP_DIR=$ROOT_DIR/pulsar-client-cpp
 
 rm -rf BUILD
 mkdir BUILD
 cd BUILD
-tar xfz $SRC_ROOT_DIR/distribution/server/target/apache-pulsar-$POM_VERSION-src.tar.gz
+tar xfz $SRC_ROOT_DIR/target/apache-pulsar-$POM_VERSION-src.tar.gz
 pushd $CPP_DIR
 
 cmake . -DBUILD_TESTS=OFF -DLINK_STATIC=ON

pulsar-client-cpp/pkg/rpm/build-rpm.sh

@@ -31,7 +31,7 @@ VERSION=`echo $POM_VERSION | awk -F-  '{print $1}'`
 
 mkdir -p BUILD RPMS SOURCES SPECS SRPMS
 
-cp $ROOT_DIR/distribution/server/target/apache-pulsar-$POM_VERSION-src.tar.gz SOURCES
+cp $ROOT_DIR/target/apache-pulsar-$POM_VERSION-src.tar.gz SOURCES
 
 rpmbuild -v -bb --clean \
         --define "version $VERSION" \

src/stage-release.sh

@@ -32,7 +32,7 @@ PULSAR_PATH=$(git rev-parse --show-toplevel)
 VERSION=`./get-project-version.py`
 popd
 
-cp $PULSAR_PATH/distribution/server/target/apache-pulsar-$VERSION-src.tar.gz $DEST_PATH
+cp $PULSAR_PATH/target/apache-pulsar-$VERSION-src.tar.gz $DEST_PATH
 cp $PULSAR_PATH/distribution/server/target/apache-pulsar-$VERSION-bin.tar.gz $DEST_PATH
 cp $PULSAR_PATH/distribution/offloaders/target/apache-pulsar-offloaders-$VERSION-bin.tar.gz $DEST_PATH