Issue #572: make kernel warn configurable #247

# to view logs

Job	Run time
test (ubuntu, 2.7, false)	4m 30s
test (ubuntu, 3.0, false)	4m 15s
test (ubuntu, 3.1, false)	4m 18s
test (ubuntu, 3.2, false)	4m 18s
test (ubuntu, 3.3, false)	4m 14s
test (macos, 2.7, false)	4m 45s
test (macos, 3.0, false)	4m 25s
test (macos, 3.1, false)	4m 27s
test (macos, 3.2, false)	4m 25s
test (macos, 3.3, false)	4m 25s
test (macos, truffleruby-head, true)	6m 7s
test (ubuntu, truffleruby-head, true)	4m 38s
test (ubuntu, jruby, true)	4m 50s
test (ubuntu, head, true)	4m 19s
	1h 3m 56s

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