Get serial from a subprocess and use it for IPMI Serial-over-LAN interfaces

Jonas Rabensteinrequested to merge
ipmi into master

By appending a | to the end of the serialpath configuration option the logic to get the serial-output is modified to not open a file but instead open a childprocess and use the stdout pipe as the serial-output.

This is then used to use the SOL console for the integration of faui49big04.

Edited by Jonas Rabenstein

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