Add common import to compute

Change-Id: I8572392bda6a4526567158dc1e49cb6315ba2a01
diff --git a/src/com/mirantis/mk/Orchestrate.groovy b/src/com/mirantis/mk/Orchestrate.groovy
index 765c8ca..d9a50e8 100644
--- a/src/com/mirantis/mk/Orchestrate.groovy
+++ b/src/com/mirantis/mk/Orchestrate.groovy
@@ -531,6 +531,7 @@
 
 def installOpenstackCompute(master, extra_tgt = '') {
     def salt = new com.mirantis.mk.Salt()
+    def common = new com.mirantis.mk.Common()
     // Configure compute nodes
     def compute_compound = "I@nova:compute ${extra_tgt}"
     if (salt.testTarget(master, compute_compound)) {