apply test_install into method

Signed-off-by: Mike Marchetti <mmarchetti@sandvine.com>
diff --git a/Jenkinsfile b/Jenkinsfile
index 25cc468..99cb405 100644
--- a/Jenkinsfile
+++ b/Jenkinsfile
@@ -27,6 +27,6 @@
                            params.GERRIT_BRANCH,
                            params.GERRIT_REFSPEC,
                            params.GERRIT_PATCHSET_REVISION,
-                           params.BUILD_SYSTEM,
+                           params.TEST_INSTALL,
                            params.ARTIFACTORY_SERVER)
 }