Stop sharing state between processes in test farm tests (#7057)
Stop sharing state between processes in test farm tests (#7057)

* Set LOGDIR at top of script.

* Set sentinel at top of script.

* Don't use EC2 global to block on instance start.

* Remove global boto3 state.

* Pass in boulder_url.

* Create main function.

* Add link to reload docs.

letsencrypt/letsencrypt,lmcro/letsencrypt,letsencrypt/letsencrypt,stweil/letsencrypt,lmcro/letsencrypt,stweil/letsencrypt