Release plugin args (#866)

* adding args to release plugin

Author: robertpatrick

pom.xml

@@ -266,6 +266,7 @@
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-release-plugin</artifactId>
                 <configuration>
+                    <arguments>-Dunit-test-wlst-dir=${unit-test-wlst-dir}</arguments>
                     <tagNameFormat>release-@{project.version}</tagNameFormat>
                     <!-- Tell release:perform to stop before trying to push to a remote repository -->
                     <goals>install</goals>