deepsea-install.sh: delete filesystems:ceph repo after using it
deepsea-install.sh: delete filesystems:ceph repo after using it

Avoid subsequent "Valid metadata not found at specified URL" errors
when Salt pkg.installed encounters this repo.

Signed-off-by: Nathan Cutler <f9d8c66a4e898e67db786769b5b347b640e1a9a6@suse.com>

smithfarm/ceph-auto-aws,smithfarm/ceph-auto-aws