network-tx checks in Nagios have UNKNOWN state

[Vitaly Gusev]

MOS 9.1 and plugins from master
Steps to reproduce:
1. Deploy an environment with 3 controllers, 1 compute+cinder and 1 plugin node
(Run deploy_toolchain test with ha_controller_nodes)
2. Once deployment finished go to Nagios UI

Expected result:
All services have OK status

Actual result:
For all nodes `*.network-tx` service has UNKNOWN state. Looks like it's a new alarm. Status information
UNKNOWN: No data received for at least 130 seconds

In /var/log/metric_collector.log:
2016/09/05 09:06:22 Plugin 'afd_node_controller_network-tx_filter' error: Terminated. Reason: timer_event() /usr/share/lma_collector_modules/afd_rule.lua:245: assertion failed!
2016/09/05 09:06:22 Plugin 'afd_node_controller_network-tx_filter': stopped
2016/09/05 09:06:22 Plugin 'afd_node_controller_network-tx_filter': has stopped, exiting plugin without shutting down.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/365602
Committed: https://git.openstack.org/cgit/openstack/fuel-plugin-lma-collector/commit/?id=f6a1d8b611841390ac443637c1b4c6920f16e642
Submitter: Jenkins
Branch: master

commit f6a1d8b611841390ac443637c1b4c6920f16e642
Author: Swann Croiset <email address hidden>
Date: Mon Sep 5 14:12:58 2016 +0200

    Add missing function for network dropped-tx alarm

    Closes-bug: #1620285

    Change-Id: Iaa42ff650ce3d4dfa4d1f8f274221cbf3d533d06