Possible bug on some installations: warcprox certificate error

[dolsysmith]

One user reports that their Twitter rest harvester is throwing the following error, not all the time, but on a regular basis (1-2 times / week):

OSError: Could not find a suitable TLS CA certificate bundle, invalid path: /tmp/tmpgf6u6jvh/warcprox-ca.pem
            "message": "Could not find a suitable TLS CA certificate bundle, invalid path: /tmp/tmpgf6u6jvh/warcprox-ca.pem"

This appears to be triggered during the execution of sfmutils.warcprox, which creates a directory to hold the certificate during processing. I'm not sure what could cause this directory to go missing, since it is created within the Docker container, and in this case, the Docker container does not appear to have been shut down during processing. We have not seen this error on any of our servers, as far as I know.

This user is using SFM on a CentOS system, but otherwise, the configuration is standard.