core/exec: add a named-descriptor option ("fd") for streams (#4179)
This commit adds a `fd` option to `StandardInput=`, `StandardOutput=` and `StandardError=` properties in order to connect standard streams to externally named descriptors provided by some socket units. This option looks for a file descriptor named as the corresponding stream. Custom names can be specified, separated by a colon. If multiple name-matches exist, the first matching fd will be used.
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