Detect whether we are running in containers and act responsively.#2063

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arbuztw wants to merge 9 commits intodnschneid:masterfrom arbuztw:container

+409-51

Commits on Sep 1, 2015

Use a daemon to find nacl_helper
arbuztw
committed

Commits on Sep 2, 2015

Fixes for review comments
arbuztw
committed

Commits on Sep 23, 2015

Mute non-fatal error messages.
arbuztw
committed

Commits on Sep 25, 2015

Do not fail on bind-mounting dbus, since it is probably not mounted in containers.
arbuztw
committed