[libvirt] Strange periodic failures of the commandtest case

[Daniel P. Berrange]

I'm getting periodic failures of the 'commandtest' case where the diff
is

> DAEMON:no
--
< DAEMON:yes

For test cases 'test3' through to 'test15', except 'test'4. Tests 1,
2, 4, 16, 17, 18 are all unaffected. I can never reproduce it when
I run just that one test case manually, but the automated builds
I'm doing hit it > 50% of the time so it is clearly some kind of race
condition. The line of code that's getting confused is this

    fprintf(log, "DAEMON:%s\n", getpgrp() == getsid(0) ? "yes" : "no");

but I'm not clear how this can be going wrong. Ideas ?

Regards,
Daniel
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