Issue #572: make kernel warn configurable #249

Job	Run time
test (ubuntu, 2.7, false)	4m 34s
test (ubuntu, 3.0, false)	4m 22s
test (ubuntu, 3.1, false)	4m 17s
test (ubuntu, 3.2, false)	4m 19s
test (ubuntu, 3.3, false)	4m 17s
test (macos, 2.7, false)	4m 49s
test (macos, 3.0, false)	4m 31s
test (macos, 3.1, false)	4m 20s
test (macos, 3.2, false)	4m 22s
test (macos, 3.3, false)	4m 32s
test (macos, truffleruby-head, true)	5m 24s
test (ubuntu, truffleruby-head, true)	4m 51s
test (ubuntu, jruby, true)	4m 54s
test (ubuntu, head, true)	4m 17s
	1h 3m 49s

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