Remove imageBuilder so default is used and can be overwritten on the … #2056

Job	Run time
build	26m 27s
fabric8_istio_integration_test	5m 18s
test (0, 32)	13m 24s
test (1, 32)	13m 24s
test (2, 32)	13m 21s
test (3, 32)	13m 1s
test (4, 32)	12m 54s
test (5, 32)	13m 4s
test (6, 32)	13m 19s
test (7, 32)	13m 19s
test (8, 32)	12m 20s
test (9, 32)	13m 19s
test (10, 32)	13m 22s
test (11, 32)	12m 7s
test (12, 32)	12m 43s
test (13, 32)	13m 20s
test (14, 32)	13m 23s
test (15, 32)	13m 20s
test (16, 32)	13m 23s
test (17, 32)	13m 24s
test (18, 32)	13m 9s
test (19, 32)	13m 24s
test (20, 32)	11m 35s
test (21, 32)	13m 20s
test (22, 32)	11m 21s
test (23, 32)	12m 50s
test (24, 32)	13m 21s
test (25, 32)	13m 23s
test (26, 32)	13m 21s
test (27, 32)	13m 19s
test (28, 32)	11m 55s
test (29, 32)	13m 10s
test (30, 32)	13m 18s
test (31, 32)	13m 18s
	7h 28m 56s

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