Set ssh_virt_type to vmware

Tests for set_boot_device and get_boot_device were incorrectly setting
the ssh_virt_type to vmware, so that it didn't get changed from the
original vbox value. This fixes it.

Change-Id: I66087ddd258852b6c36f5972deae8bde24c69572
Closes-Bug: #1360015
Merge "Set ssh_virt_type to vmware"