LLDP monitoring needs to start after setup changes are stored

See https://git.opendaylight.org/gerrit/#/c/66153/1/interfacemanager/interfacemanager-impl/src/main/java/org/opendaylight/genius/interfacemanager/renderer/ovs/statehelpers/OvsInterfaceStateAddHelper.java@114 — various calls to AlivenessMonitorUtils.startLLDPMonitoring() happen after transaction which are supposed to be really committed before LLDP monitoring can start.