Fix bug when using more than one standalone worker

Marek Szubarequested to merge
github/fork/jherrero/master into master

Created by: jherrero

The worker_temp_directory for standalone workers was set to /tmp/worker_${USER}.standalone. If two standalone workers were running on the machine, they could overwrite each other’s files. The fix include the process ID ($$ in Perl) in the directory name.

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