L3 VPN: arp entries are not cleared after the arp timeout even though traffic is not running

add a tenant with a L3 service with 4 CPEs (2 UNIs in each)
send traffic between them
stop the test - Traffic-Gen is no longer running, meaning no traffic

looking at the arp entries under operational/neutronvpn:neutron-vpn-portip-port-data
i see that the entries are not deleted (waited for more than an hour)

performed tcpdump on one of the CPE ports (c2u2) - no monitoring traffic was shown

according to Tali the timeout for the arp entry should be 2min:
https://github.com/opendaylight/netvirt/blob/master/vpnservice/vpnmanager/vpnmanager-impl/src/main/java/org/opendaylight/netvirt/vpnmanager/ArpConstants.java

attached:
karaf.log
tcpdump
folder 21-12-16---09-13-56:
CPE dump flows
karaf-models-dump.tar.gz
output - of the test