.travis.yml: allow 30 minutes of inactivity in cloud tests #287
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We're seeing CI failures currently because a LXD image takes more than
10 minutes to download if the transatlantic link to Canonical's DC is
heavily contested.
This uses a helper provided by Travis[0] to avoid cancellation due to
lack of output for 30 minutes, which should be sufficient to download an
image even at the lowest speeds we've been seeing.
[0] https://docs.travis-ci.com/user/common-build-problems/#build-times-out-because-no-output-was-received