CLOUDSTACK-6668: OVS distributed routing: ensure bridge is deleted when
last VM from the VPC is deleted on a host

OVS distributed routing: ensure bridge is deleted when last VM from the
VPC is deleted on a host. This fix ensures that bridge is
destroyed.
CLOUDSTACK-6685: OVS distributed firewall: source CIDR mismatch while
populating ingress & egress network ACL

fix ensures propoer values for nw_src and nw_dst are popoluated
depending on the ingress or egress acl
CLOUDSTACK-6686:NetworkACLItemCidrsDaoImpl uses firewallRuleId instead
of networkAclItemId

fix uses networkAclItemId instead of firewallRuleId