Remove jetty-util-ajax from shaded hadoop-cient-minicluster jar.

jetty-security 9.4.35 adds a new dependency jetty-util-ajax. Exclude it to make shading pass.

Change-Id: I9f62d76cd74bc89ede2c28d440dbe316545393aa

Author: jojochuang

hadoop-client-modules/hadoop-client-minicluster/pom.xml

@@ -840,6 +840,12 @@
                         <exclude>*/**</exclude>
                       </excludes>
                     </filter>
+                    <filter>
+                      <artifact>org.eclipse.jetty:jetty-util-ajax</artifact>
+                      <excludes>
+                        <exclude>*/**</exclude>
+                      </excludes>
+                    </filter>
                     <filter>
                       <artifact>org.eclipse.jetty:jetty-server</artifact>
                       <excludes>