Revert "Set temporary single CPU affinity before cgroup cpuset transition" #4283
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This reverts #3923, for reasons outlined in #3923 (comment). A short version below.
There's too much logic here figuring out which CPUs to use. Runc is a low level tool and is not supposed to be that "smart". What's worse, this logic is executed on every exec, making it slower. Some of the logic in (*setnsProcess).start is executed even if no annotation is set, thus making ALL execs slow.
Also, this should be a property of a process, rather than annotation.
The plan is to rework this.
This reverts commit afc23e3.