//TODO:
* improve loggings, implement other methods
* additional test cases

tests:
single host,
addition of 4 hosts (plays running simultaniously)


AnsibleConstants:
hold project & artifacts dirs and playbook name.
change if testing.

Main:
this is the test class.
uuid can't be retrieved from the test, so it needs to be created initially, and under it all relevant job_events are stored.

AnsibleExecutor:
* set play variables
* set inventory file
* run the command (ansible-runner run...)
* initiate cleanup after the play has finished and the created files aren't needed anymore.

AnsibleCommandbuilder:
* create file to store play's extra vars (such as host_deploy_cluster_name, ovirt_qemu_ca_cert, host_deploy_origin_type etc.) 
* create a new playbook (copy of the original playbook) that has a pre_tasks section where it includes these vars
* build the command to run 
* cleanup: delete the files (extraVars, specificPlaybook) that were created for the specific run

AnsibleProcessor:
* playHasEnded(): successful run ends with "playbook_on_stats" event. 
* artifactHandler: continues to process the events until it reaches the final event or 'till timeout was reached. if task failed - throws an exception
* processEvents: 
	- get the events sorted numerically- only events that haven't been handled yet.
	- return (and start processEvents again) if jsonfile is not valid
	- log each task's name,
	- log each task's output whether succeeded or failed.
	- the log contain all of the needed output, and currently saves in 2 places:
		1. host_deploy.log under the specific artifact dir (this is a temp file - more comfortable for debugging etc. will be removed in the project)
		2. under the path ansible-runner-service-project/host-deploy-logs
		   currently has the uuid & timestamp as its name- will be changed.

* initially was implemented using watch service, but some issues were raised such as-
using CREATED events didn't recognize the new events (were already created)
using MODIFIED listed the events multiple times for each change (including metadata), and made it much more complex to handle.