Robustify nginx tests

[skip ci]

While chasing a flake, I discovered that our alpine_nginx
image is broken: it returns 404 on all requests. We never
caught this because--surprise!--curl exits 0 even when
server returns 4xx/5xx status.

Let's be strict: add -f (--fail) option to all invocations
of curl.

And, although I couldn't identify the root cause of the
flake (in "run two containers with the same IP" test),
I can at least fix the broken wait-for-nginx loop, bump
up the number of retries, and improve diagnostics on
failure. And add a strict error-message check.

Signed-off-by: Ed Santiago <santiago@redhat.com>

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