Add Maven Javadoc Plugin configuration to exclude certain non-essential Apache Geode packages.

Resolves spring-projectsgh-538.

Author: jxblum

spring-data-geode/pom.xml

@@ -286,6 +286,13 @@
 					</systemProperties>
 				</configuration>
 			</plugin>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-javadoc-plugin</artifactId>
+				<configuration>
+					<excludePackageNames>org.apache.geode.lang:org.apache.geode.management.internal</excludePackageNames>
+				</configuration>
+			</plugin>
 		</plugins>
 	</build>