tests: fix has_image false positive from substring match

Change has_image() to use 'image inspect' instead of substring search
in 'images' output. The substring approach caused false positives when
images like 'nginx:alpine' were present - searching for 'alpine' would
match and skip pulling 'alpine:latest'.

This fixes TestSaveLoad::test_save_and_load which failed after the
port forwarding test introduced nginx:alpine.

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

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