Stop All Mongrels

Method name	stop_mongrels
Command	`asctl orchestrator:stop_mongrels`
Details	Stop the processes that render the UI.
Inputs	None.
Outputs	STDOUT shows that Orchestrator mongrel processes have been stopped.

# asctl orchestrator:stop_mongrels
An install specific config file can be created at /opt/aspera/var/config/orchestrator/orchestrator.yml to overwrite defaults
Command stop_all executed.