Backport get_if_addrs unit test fixes to 0.2.7
The unit tests are failing on one of our jenkins FreeBSD instances with:
https://jenkins.torproject.org/job/tor-ci-freebsd-amd64-0.2.7/19/console
41:24 address/get_if_addrs_ifaddrs: [forking]
20:41:24 FAIL ../tor/src/test/test_address.c:272: assert(smartlist_contains_localhost_tor_addr(results))
20:41:24 [get_if_addrs_ifaddrs FAILED]
There are fixes for these errors in master.
I need to locate the commit that fixes these, and backport it. (Hopefully, it's a simple cherry-pick.)