Correction of Bug 67

This is a partial corection for Bug 67 based on Michele-s suggestion
in NFVSOL(18)000230r3. At the moment only the Requests of
VNF Fault Management API are covered.

Change-Id: I30fecb9a4e1e09278d49cdda9a9c43d8bf3118e2
Signed-off-by: Gergely Csatari <gergely.csatari@nokia.com>