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>com.sonymobile.jenkins.plugins.lenientshutdown</groupId>
<artifactId>lenientshutdown</artifactId>
<version>2.125.v1156982d427d</version>
</dependency>