Fix reopen-logs command not working when executed via logrotate.

logrotate executes as root, but with a different HOME environment
variable ("/" instead of "/root"). This caused confusion for forever,
since it didn't find the pid and therefor didn't think api-umbrella was
running. We now hard-code the daemon related files to exist in
/opt/api-umbrella so the daemon discovery is consistent regardless of
the user's environment.
Disable forever from trying to restart the process.

Supervisor handles its own restarts, so we don't want fighting over
restarts if we want to really kill things.

I believe the mysterious first-install issue (and why we were still
allowing forever 1 restart attempt) was resolved by:
10efba8959d0e198c627ca739b84a243e6cb3eb2