Fail multicast test properly if pods can't be started
Fail multicast test properly if pods can't be started

If the multicast test couldn't launch its pods, then testMulticast()
would return an error, but the caller wasn't distinguishing "couldn't
launch pods" from "multicast traffic was blocked", so failing to
launch pods was accidentally being considered a successful test result
for the "should block multicast traffic" tests.

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