Merge "libprocessgroup: Prevent error spam when tests disable all cpus in a...

Merge "libprocessgroup: Prevent error spam when tests disable all cpus in a cpuset" am: 43293def am: 54a3db2f am: 006c39b1

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1818662

Change-Id: I5ca4b254b2a2437ad0a802ebcc6a8109100ddfa5