Excluded transient dependencies are (sometimes?) included

[jwiklund]

Maven exclusion doesn't work as expected (sometimes?).

Had problem with the firebase-admin that has an excluded dependency on guava-jdk5.

Steps to reproduce, use example pom with mvn dependency:tree, notice there is no reference to guava-jdk5, run java -Dcapsule.trampoline=true -jar target\example-0.0.1-SNAPSHOT-capsule.jar and see guava-jdk5-17.0.jar in the generated classpath, nb the order seems to be random since in this example the guava-21 jar comes before guava-jdk5 which doesn't cause a problem, but in my original project the jdk5 version was always before and therefor crashed the app. (I submit the bug here since the dependencies generated by the maven plugin looks correct to me, ie no guava-jdk5, but during runtime it is somehow added).

Example pom.xml

<project xmlns="http
//maven.apache.org/POM/4.0.0" xmlns
xsi="http
//www.w3.org/2001/XMLSchema-instance"
  xsi
schemaLocation="http
//maven.apache.org/POM/4.0.0 http
//maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>example</groupId>
  <artifactId>example</artifactId>
  <version>0.0.1-SNAPSHOT</version>

  <properties>
    <maven.compiler.source>1.8</maven.compiler.source>
    <maven.compiler.target>1.8</maven.compiler.target>
    <project.build.sourceEncoding>utf8</project.build.sourceEncoding>
  </properties>
  
  <dependencies>
    <dependency>
      <groupId>com.google.firebase</groupId>
      <artifactId>firebase-admin</artifactId>
      <version>5.0.0</version>
      <exclusions>
        <exclusion>
          <groupId>com.google.base</groupId>
          <artifactId>guava-jdk5</artifactId>
        </exclusion>
      </exclusions>
    </dependency>
    <dependency>
      <groupId>com.google.guava</groupId>
      <artifactId>guava</artifactId>
      <version>21.0</version>
    </dependency>
  </dependencies>
  
  <build>
    <plugins>
      <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>exec-maven-plugin</artifactId>
        <version>1.6.0</version>
        <configuration>
          <mainClass>example.Main</mainClass>
        </configuration>
      </plugin>
      <plugin>
        <groupId>com.github.chrisdchristo</groupId>
        <artifactId>capsule-maven-plugin</artifactId>
        <version>1.5.1</version>
        <configuration>
          <execPluginConfig>root</execPluginConfig>
          <type>thin</type>
          <includeApp>true</includeApp>
        </configuration>
        <executions>
          <execution>
            <goals>
              <goal>build</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>
</project>