Make lookup plugins return lists to fix failures #10569

Job	Run time
awx-operator	12m 19s
awx_collection integration (a-h, ^[a-h])	12m 59s
awx_collection integration (i-p, ^[i-p])	16m 49s
api-test	14m 32s
awx_collection integration (r-z0-9, ^[r-z0-9])	14m 22s
awx_collection sanity (stable-2.17)	1m 33s
api-migrations	10m 46s
api-lint	1m 33s
dev-env	4m 59s
api-swagger	4m 55s
awx-collection	2m 34s
api-schema	7m 36s
combine awx_collection integration coverage	55s
	1h 45m 52s

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