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.openshift.jenkins.plugins</groupId>
<artifactId>openshift-client</artifactId>
<version>1.1.0.437.v08c5053d5fe2</version>
</dependency>