The value of vRtrMvpnVrfExportTargetUnicast specifies whether unicast
vrf-target import extended community is used for the Multicast VPN
(MVPN) as well.
If the value is 'true', vRtrVrfExportTarget extended community is used
for MVPN.
If the value is 'false', vRtrMvpnVrfExportTarget extended community is
used for MVPN.