[build] merge transitive notice files to shaded notices

This closes #837.

flink-dist/pom.xml

@@ -334,6 +334,7 @@ under the License.
 								</transformer>
 								<!-- The service transformer is needed to merge META-INF/services files -->
 								<transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
+								<transformer implementation="org.apache.maven.plugins.shade.resource.ApacheNoticeResourceTransformer"/>
 							</transformers>
 						</configuration>
 					</execution>

flink-shaded-hadoop/pom.xml

@@ -84,6 +84,7 @@ under the License.
 							<transformers>
 								<!-- The service transformer is needed to merge META-INF/services files -->
 								<transformer implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer"/>
+								<transformer implementation="org.apache.maven.plugins.shade.resource.ApacheNoticeResourceTransformer"/>
 							</transformers>
 							<relocations>
 								<relocation>

flink-staging/flink-streaming/flink-streaming-connectors/flink-connector-flume/pom.xml

@@ -147,6 +147,7 @@ under the License.
 					</execution>
 				</executions>
 			</plugin>
+
 			<plugin>
 				<!-- Override artifactSet configuration to build fat-jar with all dependencies packed. -->
 				<groupId>org.apache.maven.plugins</groupId>
@@ -162,6 +163,9 @@ under the License.
 									<include>org.apache.flume:*</include>
 								</includes>
 							</artifactSet>
+							<transformers>
+								<transformer implementation="org.apache.maven.plugins.shade.resource.ApacheNoticeResourceTransformer"/>
+							</transformers>
 						</configuration>
 					</execution>
 				</executions>

flink-staging/flink-streaming/flink-streaming-connectors/flink-connector-twitter/pom.xml

@@ -86,6 +86,9 @@ under the License.
 									<include>com.twitter:joauth</include>
 								</includes>
 							</artifactSet>
+							<transformers>
+								<transformer implementation="org.apache.maven.plugins.shade.resource.ApacheNoticeResourceTransformer"/>
+							</transformers>
 						</configuration>
 					</execution>
 				</executions>

flink-yarn-tests/pom.xml

@@ -170,6 +170,9 @@ under the License.
 									<shadedPattern>org.apache.flink.hadoop.shaded.org.jboss.netty</shadedPattern>
 								</relocation>
 							</relocations>
+							<transformers>
+								<transformer implementation="org.apache.maven.plugins.shade.resource.ApacheNoticeResourceTransformer"/>
+							</transformers>
 						</configuration>
 					</execution>
 				</executions>