Fix missing definition

Change-Id: I101331e273f73ab6a0e6919d95e14e2fb9a793f1
diff --git a/src/com/mirantis/mk/Orchestrate.groovy b/src/com/mirantis/mk/Orchestrate.groovy
index 1336254..20e6d64 100644
--- a/src/com/mirantis/mk/Orchestrate.groovy
+++ b/src/com/mirantis/mk/Orchestrate.groovy
@@ -186,6 +186,7 @@
 
 
 def installContrailNetwork(master) {
+    def common = new com.mirantis.mk.Common()
     def salt = new com.mirantis.mk.Salt()