These are a few tweaks I applied to my own memory-constrained cloud
instances that seemed to help. I have lower performance requirements
so this may make things worse and not better, but it's worth seeing
what the impact is. I'll admit to not knowing the full impact of these
as they're mostly collected from various tutorials on lowering memory
usage.
Enable this for now on devstack-multinode
Change-Id: I7b223391d3de01e3e81b02076debd01d9d2f097c
(cherry picked from commit 7567359755)
(cherry picked from commit b12cc4181c)
(cherry picked from commit c4a1f86548)
(cherry picked from commit 275a84f929)
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