Make lookup plugins return lists to fix failures #10579

Job	Run time
awx-operator	12m 5s
dev-env	4m 59s
api-test	13m 58s
awx_collection integration (a-h, ^[a-h])	12m 24s
api-migrations	10m 7s
awx_collection sanity (stable-2.17)	1m 39s
awx_collection integration (i-p, ^[i-p])	15m 48s
api-lint	1m 30s
awx_collection integration (r-z0-9, ^[r-z0-9])	13m 47s
api-swagger	4m 52s
awx-collection	2m 28s
api-schema	7m 32s
combine awx_collection integration coverage	57s
	1h 42m 6s

Provide feedback