databases/couchdb: 1.7.0 incl critical security fixes

See https://blog.couchdb.org/2017/11/07/2-1-1-1-7-0/
for details; CVE notifications will land 2017-11-14

Reviewed by: olgeni (maintainer)
Approved by: jrm (mentor)
Sponsored by: https://iwantmyname.com/
Differential Revision: https://reviews.freebsd.org/D12991