Set mongo DB instance to run on Jenkins /mnt
This should provide the biggest bang-for-the-buck and can be the tracer-bullet solution for reconfiguring Jenkins jobs' uses of /mnt (i.e. the SSD storage).
Confirm mongo DB is run on ephemeral storage /mnt
Confirm mongo DB is still run on the proper dirs for non-Jenkins environments (e.g., devstack)
Get before/after run times for tests (timebox this effort)