Previously, multiple containers with the same mounted volume resulted in multiple
FUSE processes. This behaviour was breaking parallel modifications from different
containers, consumed extra resources, and after mounting via systemd was introduced,
led to the total inability to mount the same volume into multiple containers on
the same host.
Now only one FUSE process is started per volume, per host.
With this, each volume will get its own prefix within the bucket if it
is configured in the storage class. This also ensures backwards
compatibility with older volumes that have been created in earlier
versions of csi-s3.
