Naming of virtio-net interfaces is not consistent in RHEL 7

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Issue

The name of a virtio-net interface is seen to be different or unstable after a reboot.
virtio and e1000 or rtl8139 NICs change device names from eth to ens names randomly or unpredictably.

Environment

Red Hat Enterprise Linux 7
KVM or RHEV/RHV virtual machine guest using:
- One or more paravirtual NIC type using virtio-net driver
- One or more other emulated NIC type such as Intel e1000 or Realtek rtl8139

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