Correcting spelling mistakes in test_vnfm_param.py
Correcting spelling mistakes in test_vnfm_param.py

This patch is used to modify word spelling mistakes.
Here change vfn/vfnd to vnf/vnfd in test_vnfm_param.py.

Trivial Fix.

Change-Id: Ic5d1f82ecd2425210fb9f1271cc64b4b0a162fe1

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