Add API instance_monitoring.
Add API network_vif_monitor.
Add task set_enable.
Add unit test for monitoring API.
fix parameter type from hash to string.
Add component test for monitoring API.
fix monitoring parameter.
Add integration test for monitoring API.
fix No newline at end of file.
fix syntax value.
Add scenario test 1shot for instance monitoring.
Merge pull request #455 from axsh/feature-zabbix-scenario-tests

Feature zabbix scenario tests