Cleanup jobutils2 to work on ARM

[ktf]

• Avoid dependency on bc for a multiplication
• Make sure the CPU detection does not depend on the lscpu
  human readable output, which is apparently dependent on version /
  presence of a container.

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[ktf]

Tested on ARM, x86, including on the EPNs.

[ktf]

@sawenzel we seem to have the issue with the ZipFiles back on ARM. Do you remember what was the cause?

[sawenzel]

@sawenzel we seem to have the issue with the ZipFiles back on ARM. Do you remember what was the cause?

doesn't ring a bell to me

[ktf]

Gets the ARM build green. Merging.

[sawenzel]

I agree on the improvements. But note that the ARM build was green before this PR, mainly due to #14906 and alisw/alidist#6062.

[ktf]

How was that possible? Without this you have:

[root@deaca7115896 /]# lscpu | grep "Socket(s)" | awk '{print $2}'
-

maybe it was not running the full system test?