Updating the net/ceph-devel port to 2017-08-05

[Willem Jan Withagen]

Could any of the commiters take a look at:

  - https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=221569

Both poudriere and portlint have been tested.

Upgrade is due to some compile errors in the previous upgrade.

Thanx,
--WjW