CI: travis: workaround 127.0.1.1 not assigned with loopback #51
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This is so as to counterweight unfortunate change
travis-ci/travis-cookbooks@6c575d5
that made proper hostnames be mapped from 127.0.1.1 address rather than
127.0.0.1 (properly assigned to loopback interface), hence (likely)
caused "hostname -i" return that other address that is normally not
assigned to loopback (and hence booth cannot identify "itself" within
configured sites, leading to spurious test suite failure).