* *: Add .cirrus.yml for FreeBSD testing
* *: run go mod tidy
* service/test: prefer 127.0.0.1 over localhost
* dwarf/line: fix TestDebugLinePrologueParser
* vendor: rerun go mod vendor
Use godeps to vendor dependencies and the normal go toolchain, with
GO15VENDOREXPERIMENT=1 set to properly vendor dependencies for reproducible
builds.