feat(store): add store-volume and store-metadata

These components enable the logger and controller to mount
a shared filesystem backed by CephFS.
fix(deisctl): adjust start order for logger/store
fix(deisctl): remove logspout from data plane
ref(logger): switch to ubuntu-debootstrap image
Merge pull request #2092 from carmstrong/store_volume

feat(*): shared volume support for controller/logger (adds store-metadata and store-volume)