Add a temporary fix for OSTF for vCenter tests

In the implementation of our features, OSTF test cannot be
completed successfully. For this reason, we obtained a negative
result in our Jenkin's tests. This patch disables the alert about this
issue. A proper fix for OSTF will be provided a little later.

Change-Id: I642ddd026e9ab65e53988b4af975e3dffa35e772
Related-bug: #1405493