dns/dnscrypt-proxy: start before unbound

• To prevent hanging on 10.x systems which ship with unbound and depend on DNS resolving, start dnscrypt-proxy before unbound.
• Bump PORTREVISION

PR: 194975
Differential Revision: https://reviews.freebsd.org/D1249
Submitted by: Joseph Mingrone <jrm@ftfl.ca>
Approved by: koobs (mentor)