The value of vRtrMvpnVrfImportTargetUnicast specifies whether unicast
vrf-target export extended community is used for the Multicast VPN
(MVPN) as well.
If the value is 'true', vRtrVrfImportTarget extended community is used
for MVPN.
If the value is 'false', vRtrMvpnVrfImportTarget extended community is
used for MVPN.