[Opm] Travis flooded with CMake warnings

[Markus Blatt]

Hi,

looks like somebody updated the CMake version on the build server and
did not update the CMake scripts with policy settings. No the travis
logs are flooded with policy warnings and not displayed completely
because of their length (This log is too long to be displayed. Please
reduce the verbosity of your build or download the raw log.)
https://travis-ci.org/OPM/opm-simulators/builds/235220937?utm_source=github_status&utm_medium=notification

Could we either downgrade CMake, set the correct policies, or simply
use -Wno-dev to suppress these warnings when building-

Cheers,

Markus
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