RTEMS Tools | rtems-test: Leaks pipes when using a gdb based simulator (#15)

[Kinsey Moore (@opticron)]

Kinsey Moore commented on a discussion: https://gitlab.rtems.org/rtems/tools/rtems-tools/-/issues/15#note_113937


I found a recommendation that when calling proc.kill(), you should follow it with proc.communicate() to ensure that all I/O is finalized and culled. This seems to keep the pipe count to almost exactly 3x jobs, but exposes other problems on my server. The 28c56t machine is not under any load but gitlab, but seems to be less performant than my server is. AArch64 toolchain build times are:
- 8c16t(personal server): 13.75m
- 28c56t: 22m
- 8c16t VM(virtualbox on a laptop): 16m

Something is definitely going on on that machine.

Once I fixed the proc.communicate() issue, other issues start popping up on my server when the tester is coerced to run at 52 jobs:

```
[232/675] p:152 f:4   u:3   e:21  I:0   B:3   t:0   L:0   i:0   W:0   | powerpc/psim: psxcancel01.exe
error: gdb.cfg:54: macro '%{rtems_version}' not found
error: gdb.cfg:54: macro '%{rtems_version}' not found
warning: switched to dry run due to errors
error: gdb.cfg:54: macro '%{rtems_version}' not found
error: gdb.cfg:54: macro '%{rtems_version}' not found
error: gdb.cfg:54: macro '%{rtems_version}' not found
error: gdb.cfg:54: macro '%{rtems_version}' not found
error: gdb.cfg:60: macro '%{rtems_version}' not found
error: gdb.cfg:60: macro '%{rtems_version}' not found
error: gdb.cfg:60: macro '%{rtems_version}' not found
error: gdb.cfg:60: macro '%{rtems_version}' not found
[233/675] p:153 f:4   u:3   e:21  I:0   B:3   t:0   L:0   i:0   W:0   | powerpc/psim: psxchroot01.exe
...
[249/675] p:170 f:4   u:4   e:21  I:0   B:3   t:0   L:0   i:1   W:0   | powerpc/psim: psxfatal01.exe
error: config error: gdb.cfg:36: No 'target' defined
[253/675] p:170 f:4   u:4   e:21  I:0   B:3   t:0   L:0   i:1   W:0   | powerpc/psim: psxfile01.exe
[251/675] p:170 f:4   u:4   e:21  I:0   B:3   t:0   L:0   i:1   W:0   | powerpc/psim: psxfchx01.exe
```

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/tools/rtems-tools/-/issues/15#note_113937
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