Do not automatically set MONGO_ORCHESTRATION_HOME when unset.
Use current working directory for pid and log files, or MONGO_ORCHESTRATION_HOME if set. Currently these may go into the site-packages directory, and mongo-orchestration may require root privileges to run.
Addresses #117
Changes:
MONGO_ORCHESTRATION_HOME
when unset.MONGO_ORCHESTRATION_HOME
if set. Currently these may go into the site-packages directory, andmongo-orchestration
may require root privileges to run.