Exclude logback.xml from the published jar

[shitikanth]

Libraries should not be packaging logback.xml since users importing the library as a dependency lose control of their logging configuration.

                <plugin>
                    <groupId>org.apache.maven.plugins</groupId>
                    <artifactId>maven-jar-plugin</artifactId>
                    <configuration>
                        <excludes>
                            <exclude>**/logback.xml</exclude>
                        </excludes>
                    </configuration>
                </plugin>