Unified the "run_command" mechanism #1998

Job	Run time
test_indep	4m 12s
test (ki5, g1)	8m 3s
test (ki5, g2)	3m 42s
test (ki5, g3)	3m 9s
test (ki6, g1)	6m 40s
test (ki6, g2)	7m 0s
test (ki6, g3)	4m 45s
test (ki7, g1)	7m 8s
test (ki7, g2)	5m 47s
test (ki7, g3)	4m 59s
Consolidate coverage data	0s
Finish Coveralls	0s
Triggers the docker images creation	0s
	55m 25s

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