Fixes mock calls in Hyper-V test method
Fixes mock calls in Hyper-V test method

Fixes bug: #1177605

This patch adds missing mocked calls to the test method
test_spawn_nova_net_vif_no_vswitch_exception implementation.

Change-Id: I115e2e081ef1273c78de1bba1414002d30eaa574

n0ano/ganttclient