A compatibility issue of live-migration in RHOSP

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Issue

A compatibility issue of live-migration and evacuate in RHOSP
When an instance is migrated from a RHEL7.4 host to a RHEL7.2 host, nova generates following log.
```
The instance requires a newer hypervisor version than has been provided.
```

Environment

Red Hat OpenStack Platform
Red Hat Enterprise Linux 7
KVM
libvirt
qemu-kvm

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