security/tor: update 0.2.9.10 -> 0.3.0.8

PR: 219246, 219863
Submitted by: Yuri Victorovich <yuri@rawbw.com> (maintainer)
Approved by: ports-secteam (miwi, feld)
MFH: 2017Q2
Relnotes: https://gitweb.torproject.org/tor.git/tree/ChangeLog
Security: TROVE-2017-002, CVE-2017-0375, CVE-2017-0376