This feature replaces splitting of compute hosts into inner
and external with a new variable 'neutron_compute_dvr_mode'
that controls whether computes will have full-blown DVR or
internal only (tenant) networking.
Change-Id: I6720ccfcfcec89f9996d4cb5ae60f31eb3113667
Implements: blueprint dvr-mode-property
1c1d6e20c1