start pruning tracing

Change-Id: I62d41b31b65eb74fc116f9b1961996135f18ed65
remove nova conf regeneration

not really needed to roll forward, and it actually breaks the
rabbit host config in CI.

Change-Id: Ia3169d4333e7f50bb45d041d7667171b8e2739d1
set the grizzly floating pools to folsom defaults

with this grenade fully passes for me!

Change-Id: I4b7ba77e6405a638d9e9130a7dc92388d9181065
minimize cinder configuration changes

cinder actually only needs a few very specific changes to move from
folsom to grizzly. Make upgrade-cinder only do these to help with
documenting minimum changes to move forward.

Change-Id: I411a1af3d9eeeaca4a0e4129c9727d2f7bd7651d
Merge "remove nova conf regeneration"
Merge "set the grizzly floating pools to folsom defaults"
Merge "minimize cinder configuration changes"
Merge "start pruning tracing"
Merge branch 'nova-clean' into dt-test