Make lookup plugins return lists to fix failures #10562

Job	Run time
awx-operator	12m 19s
awx_collection integration (a-h, ^[a-h])	12m 25s
awx_collection integration (i-p, ^[i-p])	16m 26s
api-test	14m 24s
awx_collection integration (r-z0-9, ^[r-z0-9])	14m 10s
api-migrations	10m 48s
api-lint	1m 29s
awx_collection sanity (stable-2.17)	1m 28s
api-swagger	5m 0s
dev-env	4m 57s
awx-collection	2m 26s
api-schema	7m 54s
combine awx_collection integration coverage	49s
	1h 44m 35s

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