As a plugin developer you can use this plugin as dependency of your plugin by adding a dependency tag to your POM.
To add the latest version of this plugin as a maven dependency, use the following:
<dependency>
    <groupId>org.jenkins-ci.plugins</groupId>
    <artifactId>libvirt-slave</artifactId>
    <version>315.v5d33b_333a_551</version>
</dependency>