Shade Protobuf to prevent conflicts with Spark (#1430) (#1437)

* shade protobuf

* fix

Author: yangw1234

zoo/pom.xml

@@ -447,7 +447,19 @@
                                 </execlude>
                             </excludes>
                         </filter>
+                        <filter>
+                            <artifact>com.google.protobuf</artifact>
+                            <excludes>
+                                <exclude>META-INF/maven/com.google.protobuf/protobuf-java/*</exclude>
+                            </excludes>
+                        </filter>
                     </filters>
+                    <relocations>
+                        <relocation>
+                            <pattern>com.google.protobuf</pattern>
+                            <shadedPattern>com.intel.analytics.zoo.shaded.protobuf</shadedPattern>
+                        </relocation>
+                    </relocations>
                 </configuration>
                 <executions>
                     <execution>
@@ -457,8 +469,8 @@
                             <artifactSet>
                                 <includes>
                                     <include>org.spark-project.spark:unused</include>
+                                    <include>com.google.protobuf</include>
                                 </includes>
-
                             </artifactSet>
                         </configuration>
                         <goals>