Zabbix fuel-library integration

this commit is made by squashing 12 commits:

Zabbix server installation

Add custom types for zabbix configuration

Add basic server config

Zabbix agent installation
Basic OS monitoring

Add nova monitoring with zabbix
Keystone monitoring with zabbix

Glance monitoring with zabbix

cinder and swift monitoring with zabbix

memcached, mysql, horizon and rabbit monitoring with zabbix

misc services monitoring with zabbix

haproxy, zabbix server, firewall, virtual openstack cluster

Neutron monitoring with zabbix

Add zabbix class declaration to osnailyfacter
Add minor fix to zabbix agent scripts
Userparameters now use the correct zabbix_agent.d path
Fixed mysql userparameters
Unset mysql root password
Fix for rabbitmq-manage exec call
Retry API call to zabbix, if it's unavailable
Configure zabbix server to log to rsyslog

Change-Id: I97590c19dc974636dc7f718becd5e6cad20f96c5
Implements: blueprint monitoring-system
Merge "Zabbix fuel-library integration"