Fix call to package goal for ci.maven 3.1 release

[cherylking]

With the 3.1 release of ci.maven, you need to specify runnable in the include parameter once again. No need to specify packageType (defaults to jar when runnable is specified) or outputDirectory (defaults to ${project.build.directory}/liberty-alt-output-dir for package goal and install-feature goal). Change the following code in LibertyRuntime.java:

private void createUberJar() throws MojoExecutionException {
        executeMojo(getPlugin(), goal("package"),
                configuration(element(name("isInstall"), "false"), element(name("include"), "minify"),
                        element(name("outputDirectory"), "target/liberty-alt-output-dir"),
                        element(name("packageType"), "jar"), element(name("serverName"), serverName)),
                env);
    }

to

private void createUberJar() throws MojoExecutionException {
        executeMojo(getPlugin(), goal("package"),
                configuration(element(name("isInstall"), "false"), element(name("include"), "minify,runnable"), element(name("serverName"), serverName)),
                env);
    }