net/ceph-devel: Add port to the tree.
Ceph is a distributed object store and file system designed to
provide excellent performance, reliability and scalability.

PR: 217046
Submitted by: Willem Jan Withagen <wjw@digiware.nl>
Reported by: Willem Jan Withagen <wjw@digiware.nl>
Reviewed by: asomers, feld, mat, mmokhi
Approved by: asomers, feld (mentor)
Differential Revision: https://reviews.freebsd.org/D9584