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Description of problem:
Guest could be booted if we specify rhel7.1 new feature with -M RHEL7.0/RHEL6.x on rhel7.1 host. Consequences might have 
1. From end user pov, boot successfully means we support it, however, we do not fully support new features under older machine type.

2. https://bugzilla.redhat.com/show_bug.cgi?id=1175099 and Bug 1172643 - migration/pci-bridge: 7.1rhev->7.0 fails

Version-Release number of selected component (if applicable):
qemu-kvm-rhev-2.1.2-17.el7

How reproducible:
100%

Steps to Reproduce:
1.Boot guest with pci bridge or ovmf with -M rhel6.x on rhel7.1 host
2.
3.

Actual results:
Guest could be booted successfully but migration fail 

Expected results:
Guest should not be booted if we specify the devices we do not plan to support with -M


Additional info:

PCI bridges were tech preview, so there's no problem in not supporting migration.  AHCI will probably be the same when we start supporting Q35 fully.

For OVMF probably the bug should not be closed, but just deferred to 7.2.  I'm reopening bug 1175099.

In any case, QE is already opening bug when they find new stuff not working on old machine types.  Changing this to a tracker.

All dependent bugs verified.