[Global options][Added] `layer_defaults` #1892

Job	Run time
test_indep	6m 59s
test (ki5, g1)	6m 34s
test (ki5, g2)	2m 50s
test (ki5, g3)	1m 45s
test (ki6, g1)	12m 16s
test (ki6, g2)	3m 44s
test (ki6, g3)	2m 10s
test (ki7, g1)	9m 30s
test (ki7, g2)	3m 15s
test (ki7, g3)	2m 47s
Finish Coveralls	0s
Consolidate coverage data	0s
Triggers the docker images creation	0s
	51m 50s

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