add node specifier to build

Change-Id: Id8fb2b07f327761b6defa2251ce90f80f44de05b
Signed-off-by: Mike Marchetti <mmarchetti@sandvine.com>

jenkins/ci-pipelines/ci_stage_1.groovy

@@ -25,7 +25,8 @@ def Get_MDG(project) {
     return project
 }
 
-node {
+node("${params.NODE}") {
+
     mdg = Get_MDG("${GERRIT_PROJECT}")
     println("MDG is ${mdg}")