Test updater-script integration for CentOS 7

[jhawkwind]

Thoroughly tested updater-script integration for CentOS 7

[jhawkwind]

Updater script is broken, because the way it obtains the output is not context safe and will not separate from the logging output.

I believe it is because EGREP is not part of the factorio_t context and as such have no permission to write back to the unconfined_service_t context, and so the only output provided is the whole string. Also too much is being done inside the as_user process. The string parsing should be happening at the script itself and not as the execution.