[fix][misc] Rename netty native libraries in pulsar-client-admin-shaded (apache#22954)

(cherry picked from commit ddb03bb)
(cherry picked from commit a7d4e20)

Author: lhotari

pulsar-client-admin-shaded/pom.xml

@@ -304,6 +304,31 @@
           </execution>
         </executions>
       </plugin>
+
+      <plugin>
+        <!-- This plugin is used to run a script after the package phase in order to rename
+            libnetty_transport_native_epoll_x86_64.so from Netty into
+            liborg_apache_pulsar_shade_netty_transport_native_epoll_x86_64.so
+            to reflect the shade that is being applied.
+         -->
+        <artifactId>exec-maven-plugin</artifactId>
+        <groupId>org.codehaus.mojo</groupId>
+        <executions>
+          <execution>
+            <id>rename-epoll-library</id>
+            <phase>package</phase>
+            <goals>
+              <goal>exec</goal>
+            </goals>
+            <configuration>
+              <executable>${project.parent.basedir}/src/${rename.netty.native.libs}</executable>
+              <arguments>
+                <argument>${project.artifactId}</argument>
+              </arguments>
+            </configuration>
+          </execution>
+        </executions>
+      </plugin>
     </plugins>
   </build>
 </project>