fprime-gds: Have ZMQ pipes append user name and process ID.

[timcanham]

F´ Version	4.x
Affected Component	n/a

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Feature Description

When opening pipes for the ZMQ queues, append the user name and process ID of GDS process to the pipe name.

Rationale

Using /tmp/fprime-server-x causes collisions between users and limits the fprime GDS to one instance on a given machine. Appending the user name deconflicts users and and the process ID allows users to run multiple copies at once.