Hyper-V: Fix retrieving console logs on live migration

Due to a small nit, the VM console log files are not copied properly
during live migration.

This patch fixes the issue, removing as well two unused arguments.

Closes-Bug: #1399127
Change-Id: I530e18adc0794873de45e6232abdd093f82f82fe

Conflicts:
	nova/tests/unit/virt/hyperv/test_vmops.py