[v6r12] More pilot fixes

Added pilot command getCPURequirements, added getCPUTime function in CPUNormalization module, and script to launch it from within the pilot.

The getCPURequirements command uses dirac-wms-get-cpu-normalization script to calculate the cpu normalization instead of taking it from the CS (which in turn is got from the BDII). This is more accurate and generic.