Mount /opt/credentials for new TOSCA engine

Change-Id: I1fef2c6d16eb60d0ed3849c5e9208b4658e5a49a
diff --git a/scenarios/mock/Vagrantfile b/scenarios/mock/Vagrantfile
index bedc938..774c81e 100644
--- a/scenarios/mock/Vagrantfile
+++ b/scenarios/mock/Vagrantfile
@@ -13,6 +13,7 @@
   # sync these folders with VM
   config.vm.synced_folder "../../../", "/opt/cord/", create: true
   config.vm.synced_folder "../../../../cord_profile/", "/opt/cord_profile/", create: true
+  config.vm.synced_folder "../../platform-install/credentials/", "/opt/credentials/", create: true
 
   # set the headnode VM
   config.vm.define "headnode" do |d|