test: Remove race between commands run in the same context

context_run() has a race condition if two commands are run in close
proximity (generally involving at least one in the background).  Because we
always use the same name for the temporary fifo files, if another command
is issued while the fifos for the first still exist, mkfifo will fail,
typically causing the entire test script to jam.

Create unique names for the temporary fifos to avoid this problem.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>

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