daemon, interfaces, travis: workaround build ID with Go 1.9, use 1.9 for travis tests #7063
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Resurrecting #7060
It is assumed that the test binary has a build ID, either added by Go
toolchain (happens by default with Go 1.10+) or by gcc (only when built with
CGO). Since osutil package no longer requires CGO, the latter case does take
place.
When running with Go 1.9, the tests assuming build ID presence fail because the
Go toolchain never added one. Instead of working around the toolchain, add
mocking where needed.