Added option to handling workspace getting for concurrency builds

Change-Id: I488894dc22cf37617a2eddbb79a3afb614463926
diff --git a/src/com/mirantis/mk/Common.groovy b/src/com/mirantis/mk/Common.groovy
index 1732da4..97b28c8 100644
--- a/src/com/mirantis/mk/Common.groovy
+++ b/src/com/mirantis/mk/Common.groovy
@@ -26,9 +26,15 @@
  * Currently implemented by calling pwd so it won't return relevant result in
  * dir context
  */
-def getWorkspace() {
+def getWorkspace(includeBuildNum=false) {
     def workspace = sh script: 'pwd', returnStdout: true
     workspace = workspace.trim()
+    if(includeBuildNum){
+       if(!workspace.endsWith("/")){
+          workspace += "/"
+       }
+       workspace += env.BUILD_NUMBER
+    }
     return workspace
 }