Improve testing of elliptic curve validation

This involves:

- A directory of valid and invalid PEM-encoded curves.
  This is non-exhaustive and can be added to.
- A minor patch to 'openssl ecparam' to make it exit non-zero
  when curve validation fails.

- A test recipe is added in a separate commit.
Reviewed-by: NRich Salz <rsalz@openssl.org>
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/2544)

test/recipes/15-test_ecparam_data/invalid/c2pnb208w1-reducible.pem

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+-----END EC PARAMETERS-----
+

test/recipes/15-test_ecparam_data/invalid/nistp256-nonprime.pem

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+-----END EC PARAMETERS-----

test/recipes/15-test_ecparam_data/invalid/nistp256-offcurve.pem

+-----BEGIN EC PARAMETERS-----
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+-----END EC PARAMETERS-----

test/recipes/15-test_ecparam_data/invalid/nistp256-wrongorder.pem

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test/recipes/15-test_ecparam_data/valid/c2pnb163v1-explicit.pem

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test/recipes/15-test_ecparam_data/valid/c2pnb163v1-named.pem

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test/recipes/15-test_ecparam_data/valid/c2pnb163v2-explicit.pem

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test/recipes/15-test_ecparam_data/valid/c2pnb163v2-named.pem

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test/recipes/15-test_ecparam_data/valid/c2pnb163v3-explicit.pem

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test/recipes/15-test_ecparam_data/valid/c2pnb163v3-named.pem

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test/recipes/15-test_ecparam_data/valid/c2pnb176v1-explicit.pem

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test/recipes/15-test_ecparam_data/valid/c2pnb176v1-named.pem

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test/recipes/15-test_ecparam_data/valid/c2pnb208w1-explicit.pem

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test/recipes/15-test_ecparam_data/valid/c2pnb272w1-explicit.pem

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test/recipes/15-test_ecparam_data/valid/c2pnb272w1-named.pem

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test/recipes/15-test_ecparam_data/valid/c2pnb304w1-explicit.pem

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test/recipes/15-test_ecparam_data/valid/c2pnb304w1-named.pem

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test/recipes/15-test_ecparam_data/valid/c2pnb368w1-explicit.pem

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test/recipes/15-test_ecparam_data/valid/c2pnb368w1-named.pem

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test/recipes/15-test_ecparam_data/valid/c2tnb191v1-explicit.pem

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test/recipes/15-test_ecparam_data/valid/c2tnb191v1-named.pem

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test/recipes/15-test_ecparam_data/valid/c2tnb191v2-explicit.pem

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test/recipes/15-test_ecparam_data/valid/c2tnb191v2-named.pem

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test/recipes/15-test_ecparam_data/valid/c2tnb191v3-explicit.pem

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test/recipes/15-test_ecparam_data/valid/c2tnb239v1-explicit.pem

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test/recipes/15-test_ecparam_data/valid/c2tnb239v2-explicit.pem

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