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.openshift.jenkins</groupId>
<artifactId>openshift-login</artifactId>
<version>1.1.0.263.v2e0ddecf8b_25</version>
</dependency>