sonic: change some interfaces to 'internal' #2150

Job	Run time
test (3.8, 1)	11m 55s
test (3.8, 2)	10m 39s
test (3.8, 3)	10m 55s
test (3.8, 4)	12m 48s
test (3.9, 1)	11m 37s
test (3.9, 2)	11m 21s
test (3.9, 3)	10m 58s
test (3.9, 4)	11m 28s
Merge and update test durations	17s
	1h 31m 58s

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