The use of whole percent values for cgroup.conf parameters such
as AllowedRAMSpace, MaxRAMPercent, AllowedSwapSpace and MaxSwapPercent
may be too coarse grained on systems with large amounts of memory.
(e.g. 1% of 64G is over 650MB).

This patch allows these percentage values to be arbitrary floating
point numbers to allow finer grained tuning of these limits and
parameters.