testsuite: improve test reliability and prepare for asan testing #1733
test: check for output sync support, add to centos
The devtoolset-7-make package has been added to our centos-7 image so we can count on output sync for travis, and the travis_run script checks for a recent make, if it's not available it tries to load the SCL for the devtoolset, if that fails it just goes ahead without sync.
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