XP Channel for wildfly-jar-maven-plugin

[tommaso-borgato]

TODO: once #126 is merged, rebase and add XP channel parameters to class deployments/intersmash-deployments-provider/src/main/java/org/jboss/intersmash/deployments/WildflyDeploymentApplicationConfiguration.java and update its generateAdditionalMavenArgs() method to pass them along to the upcoming build;

Description

This PR completes and integrates the wildfly-deployments-build.eapxp profile in order to configure a single channel for xp builds in the wildfly-jar-maven-plugin, e.g.:

                                <channels>
                                    <channel>
                                        <manifest>
                                            <groupId>${wildfly.xp-channel.groupId}</groupId>
                                            <artifactId>${wildfly.xp-channel.artifactId}</artifactId>
                                            <version>${wildfly.xp-channel.version}</version>
                                        </manifest>
                                    </channel>
                                </channels>

Type of change

• Bug fix (non-breaking change which fixes an issue)
• Feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change
• Chore (non-breaking change which doesn't affect codebase;
  test, version modification, documentation, etc.)

Checklist

• Code contributed by me aligns with current project license: Apache 2.0
• Pull Request contains a description of the changes
• Pull Request does not include fixes for multiple issues/topics
• Code is self-descriptive and/or documented
• I have implemented unit tests to cover my changes
• I tested my code in OpenShift

[fabiobrz]

Thanks for this PR @tommaso-borgato - I dropped just one comment.