Using the 'network.vxlan.mode' setting you can switch between the multicast (default) and evpn VXLAN modes on a KVM Agent.
When nothing is configured CloudStack will default to multicast by using the modifyvxlan.sh script in the background.
If this setting is set to 'evpn' the KVM Agent will execute the 'modifyvxlan-evpn.sh' script which will configure the VXLAN
devices for EVPN (usually with FRRouting with BGP) mode.
This removes the need to manually replace a shell script on the hypervisor to switch modes.
Existing environments are not touched by this and it is safe to add this setting a an environment already using EVPN for the
VXLAN deployment.
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