Consistent benchmark values definition in ARC

In the current code we had several places where cluster benchmark values are used for advertising purposes:

• [infosys/cluster] and [queue] for infosys
• [arex/jura/apel] blocks (benchmark is mandatory for APEL publishing)
• and local accounting database suppose to have benchmark recorded on per-job basis depend on WN selected (most probably per-queue granularity but some common values in [lrms] block can be introduced)

Now all this parts are out of sync and have different syntax for specifying both benchmark type and values. We have to review it with @floridop and come to more formal standardized way that works across different subsystems.

This means per-job benchmark accounting will be rolled out after the main code (see !813 (merged)) will be released.