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.
Fix soft poweroff to send the correct string to kvm monitor
Merge pull request #455 from axsh/feature-zabbix-scenario-tests

Feature zabbix scenario tests
Merge pull request #454 from axsh/fix-kvm-rb-soft-poweroff

Fix soft poweroff to send the correct string to kvm monitor
skip ha_enabled=0 instance to move and put them into halted state.
local volume device has no method to set host node object.
better logging for the instance HA scheduling result.
ensure to prevent from getting instance rows updated during HA scheduling.
Merge pull request #458 from axsh/fix-ha-scheduler

Fix HA scheduler
Look RUN=yes up only at auto start. no need at "initctl start vdc-****".