Fix KVM test rejecting '-machine'
Fix KVM test rejecting '-machine'

a05ff2f79dce1f4f5135fefde097a05a92a56177 replaced the '-M' KVM command
line argument with '-machine', but did not update the KVM test which
continues to expect '-M'.

mbakke/ganeti,ganeti/ganeti,mbakke/ganeti,mbakke/ganeti,ganeti/ganeti,ganeti/ganeti