List quay.io images during Shippable run.

(cherry picked from commit a96a51b0c6)

test/utils/shippable/shippable.sh

@@ -10,6 +10,7 @@ script="${args[0]}"
 test="$1"
 
 docker images ansible/ansible
+docker images quay.io/ansible/*
 docker ps
 
 for container in $(docker ps --format '{{.Image}} {{.ID}}' | grep -v '^drydock/' | sed 's/^.* //'); do